秘鲁西北部早白垩世Oyotún组火山岩层序、年代学及地球化学特征——对古Farallon板块俯冲作用细节的揭示

段政; 郭维民; 曾勇; 刘君安; AsteteIgor; GuerreroLeyla

秘鲁西北部早白垩世Oyotún组火山岩层序、年代学及地球化学特征——对古Farallon板块俯冲作用细节的揭示

1.
中国地质调查局南京地质调查中心, 江苏南京 210016
2.
秘鲁地质矿产冶金研究院(INGEMMET), 秘鲁利马 15074

基金项目:

中国地质调查局项目《海上丝绸之路大洋洲和南美洲矿产资源潜力评价》 DD20160110

详细信息

中图分类号: P534.53;P588.14
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出版历程
- 收稿日期: 2017-03-19
- 修回日期: 2017-09-18
- 网络出版日期: 2023-08-15
- 刊出日期: 2017-11-30

Sequence, age and geochemistry of volcanic rocks of the Early Cretaceous Oyotún Formation in northwestern Peru: Revelation for the details of paleo-Farallon subduction

1.
Nanjing Center, China Geological Survey, Nanjing 210016, Jiangsu, China
2.
Instituto Geológico Minero y Metalúrgico(INGEMMET), Lima 15074, Peru

摘要

摘要:
Oyotún组火山岩为中安第斯西北缘中生代出露范围最广的一套火山岩，对研究中安第斯早白垩世壳幔相互作用具有重要意义。研究区西部Oyotún组火山岩出露面积小，厚度薄，岩性单一，而东部出露范围大，厚度厚，岩性复杂。LA-ICP-MS锆石U-Pb定年表明，Oyotún组火山岩时代集中在139.7~131.0Ma之间。主量元素SiO₂含量介于54.44%~72.33%之间，中等富MgO（0.56%~1.55%），偏铝-强过铝，A/CNK=0.98~3.51，富集Cs、Rb、Th、U、Pb和轻稀土元素，无明显Eu异常，亏损Nb、Ta、Ti、P等，具明显的火山弧特征。Oyotún组火山岩ε_Hf（t）值在3.37~8.42之间，且底部ε_Hf（t）值显著低于顶部，指示其可能形成于活动陆缘弧后伸展背景下，由亏损地幔衍生的新生玄武质下地壳，经板片流体作用而产生的低程度部分熔融过程，并受到太古宙古老陆壳物质的混染，其混染程度随时代变新而逐渐减小。
- 秘鲁西北部 /
- 早白垩世 /
- Oyotún组火山岩 /
- 层序 /
- 年龄 /
- 地球化学
Abstract:
The Oyotún Formation volcanic rocks are extremely widely distributed Mesozoic volcanic rocks in Northwestern Central Andes, and have important implications for understanding the Early Cretaceous crust-mantle interactions in Central Andes. The volcanic rocks are exposed in a small area with thin thickness and uniform lithology in the west, and are outcropped extensively with large thickness and more complex lithofacies in the west. LA-ICP-MS zircon U-Pb dating shows that the Oyotún volcanic rocks are concentrated in the range of 139.7~131.0Ma. Geochemically, the Oyotún Formation volcanic rocks show the SiO₂ range from 54.44% to 72.33%, medium enrichment of MgO (0.56%~1.55%), metaluminous-strong peraluminous nature (A/CNK=0.98~3.51), enrichment of Cs, Rb, Th, U, Pb and LREE with indistinct negative europium anomalies, and depletion of Nb, Ta, Ti, P, suggesting obvious characteristics of volcanic arc. The ε_Hf(t) of Oyotún Formation volcanic rocks are between 3.37 and 8.42, with the ε_Hf(t) values at the bottom significantly lower than the values at the top, indicating that the rocks possibly originated from the process of low degree partial melting of the juvenile basaltic crust through the action of plate fluid, with the contamination of Archean ancient continent materials. The degree of contamination decreased when the ages became younger. The juvenile basaltic crust was probably derived from depleted mantle in an extension setting on the active continental margin.
- northwestern Peru /
- Early Cretaceous. /
- volcanic rocks of the Oyotún Formation /
- sequence /
- age

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致谢: 本研究得到中国地质调查局南京地质调查中心姚仲友教授级高级工程师、沈加林高级工程师，中国地质大学（武汉）刘勇胜教授等的指导和帮助，中国地质科学院矿产资源研究所宋学信研究员提出极有价值的意见，在此一并表示感谢。

图 1 秘鲁西北部Chiclayo地区地质简图

Figure 1. Geologic sketch map of Chiclayo area in northwestern Peru

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图 2 研究区中生代地层柱状对比

Figure 2. Stratigraphic column correlation of Mesozoic in the study area

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图版Ⅰ

a、b.研究区西部Badanggrande地区英安质含角砾晶屑熔结凝灰岩（a露头；b单偏光）；c、d.东北部Sammaca地区石泡流纹岩（c单偏光；d正交偏光）；e、f.研究区东部Pucará地区英安岩（e露头；f正交偏光）。Pl—斜长石；Qz—石英

图版Ⅰ.

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图 3 研究区Oyotún组火山岩锆石U-Pb年龄谐和图

Figure 3. U-Pb concordia diagram of the zircons from Oyotún Formation volcanic rocks

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图 4 研究区东部Pucará地区Oyotún组火山岩锆石U-Pb年龄谐图

Figure 4. U-Pb concordia diagram of the zircons from Oyotún Formation volcanic rocks in Pucará of eastern area

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图 5 研究区Oyotún组火山岩TAS分类图解（a）^[21]和SiO₂-K₂O分类图解（b）^[22]（图a的岩石系列分界线据参考文献[23]）

Figure 5. TAS classification (a) and SiO₂ versus K₂O diagrams (b) of the studied volcanic rocks

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图 6 研究区Oyotún组火山岩哈克图解

Figure 6. Harker diagrams of Oyotún Formation volcanic rocks

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图 7 研究区Oyotún组火山岩原始地幔标准化微量元素蛛网图（a）与球粒陨石标准化稀土元素配分模式图（b）（原始地幔值据参考文献[24]；球粒陨石值据参考文献[25]）

Figure 7. Primitive mantle-normalized trace element spidergram (a) and chondrite-normalized REE patterns (b) for Oyotún Formation

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图 8 研究区Oyotún组火山岩锆石²⁰⁶Pb/²³⁸U年龄-ε_Hf(t)关系

Figure 8. ²⁰⁶Pb/²³⁸U age versus ε_Hf(t) diagram of the zircons from Oyotún Formation in the study area

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图 9 研究区Oyotún组火山岩构造环境判别图解（底图据参考文献[43-45]修改）

DM—亏损地幔；E-MORB—富集型洋中脊玄武岩；N-MORB—正常型洋中脊玄武岩；OIB—洋岛玄武岩；Dupal OIB—异常型洋岛玄武岩；MORB—洋中脊玄武岩

Figure 9. Discrimination of tectonic setting for Oyotún Formation volcanic rocks in the study area

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表 1 Oyotún组火山岩LA-ICP-MS锆石U-Th-Pb分析数据

Table 1 LA-ICP-MS zircon U-Th-Pb dating data of Oyotún Formation

分析点号	Pb^*/10^-6	Th/10^-6	U/10^-6	Th/U	²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁸Pb/²³²Th
分析点号	Pb^*/10^-6	Th/10^-6	U/10^-6	Th/U	比值	1σ	比值	1σ	比值	1σ	年龄/Ma	1σ	年龄/Ma	1σ	年龄/Ma	1σ
样品	西部Salas地区Oyotún组顶部的英安质晶玻屑凝灰岩
TW2313-0-1-01	28.35	548.67	1023.13	0.54	0.0485	0.0017	0.1376	0.0048	0.0205	0.0003	130.9	4.3	130.6	1.9	125.9	5.3
TW2313-0-1-02	74.09	245.71	342.43	0.72	0.1004	0.0056	1.9710	0.1382	0.1371	0.0030	1105.7	47.3	828.0	16.8	1065.6	53.7
TW2313-0-1-04	40.54	250.40	725.07	0.35	0.0601	0.0020	0.3570	0.0130	0.0430	0.0010	310.0	9.8	271.4	6.4	292.8	14.3
TW2313-0-1-05	78.69	105.83	523.72	0.20	0.0700	0.0017	1.2519	0.0364	0.1285	0.0020	824.3	16.4	779.3	11.7	864.7	34.7
TW2313-0-1-06	20.92	437.02	754.98	0.58	0.0571	0.0044	0.1567	0.0113	0.0204	0.0007	147.8	9.9	130.4	4.6	137.8	9.2
TW2313-0-1-07	44.67	688.01	907.87	0.76	0.0497	0.0017	0.2245	0.0081	0.0327	0.0006	205.6	6.7	207.1	3.4	208.2	7.9
TW2313-0-1-08	17.89	284.82	590.05	0.48	0.0495	0.0029	0.1468	0.0087	0.0215	0.0006	139.1	7.7	137.2	3.8	163.8	12.6
TW2313-0-1-09	51.32	1179.70	1548.02	0.76	0.0494	0.0017	0.1473	0.0051	0.0215	0.0004	139.5	4.5	137.3	2.3	143.3	5.4
TW2313-0-1-10	24.32	475.57	795.18	0.60	0.0517	0.0020	0.1510	0.0058	0.0213	0.0004	142.8	5.1	135.6	2.3	140.6	5.8
TW2313-0-1-11	30.44	761.92	972.51	0.78	0.0499	0.0019	0.1420	0.0053	0.0206	0.0003	134.8	4.7	131.6	2.1	139.6	5.5
TW2313-0-1-12	26.36	517.95	843.01	0.61	0.0479	0.0019	0.1405	0.0054	0.0212	0.0003	133.5	4.8	135.0	1.9	145.0	5.7
TW2313-0-1-13	70.13	62.91	76.58	0.82	0.2083	0.0050	16.0650	0.4299	0.5529	0.0110	2880.7	25.6	2837.3	45.6	2667.9	99.1
TW2313-0-1-14	28.42	611.53	971.85	0.63	0.0500	0.0021	0.1418	0.0055	0.0206	0.0004	134.6	4.9	131.5	2.6	130.3	6.0
TW2313-0-1-15	39.44	1071.78	1267.04	0.85	0.0537	0.0021	0.1537	0.0060	0.0206	0.0004	145.2	5.3	131.6	2.4	124.5	6.0
TW2313-0-1-16	89.88	99.88	102.08	0.98	0.1984	0.0058	13.5670	0.3663	0.4886	0.0085	2720.0	25.5	2564.6	36.8	2562.0	108.0
TW2313-0-1-17	20.63	374.42	702.91	0.53	0.0567	0.0026	0.1602	0.0070	0.0203	0.0004	150.9	6.1	129.5	2.3	140.7	6.8
TW2313-0-1-18	20.00	371.51	677.89	0.55	0.0539	0.0030	0.1524	0.0080	0.0204	0.0004	144.1	7.0	130.1	2.3	142.3	7.9
TW2313-0-1-19	20.98	403.37	699.38	0.58	0.0494	0.0026	0.1448	0.0075	0.0213	0.0004	137.3	6.7	135.6	2.7	142.4	7.7
TW2313-0-1-20	39.65	903.48	1322.81	0.68	0.0575	0.0026	0.1600	0.0068	0.0201	0.0003	150.7	5.9	128.0	2.1	129.6	4.7
TW2313-0-1-21	38.69	1101.03	1165.38	0.94	0.0547	0.0024	0.1530	0.0066	0.0201	0.0003	144.5	5.8	128.2	2.1	132.8	5.5
TW2313-0-1-22	23.45	441.99	791.75	0.56	0.0548	0.0026	0.1579	0.0073	0.0209	0.0005	148.8	6.4	133.1	2.9	145.9	6.4
TW2313-0-1-24	34.07	51.60	398.83	0.13	0.0580	0.0020	0.6047	0.0217	0.0750	0.0012	480.2	13.7	466.2	7.4	527.9	27.3
样品	西部Badanggrande地区Oyotún组顶部的英安质含角砾晶屑熔结凝灰岩
TW3141-1-1-01	23.73	666.12	925.97	0.72	0.0496	0.0016	0.1385	0.0049	0.0200	0.0003	131.7	4.3	127.4	1.9	130.4	4.9
TW3141-1-1-02	26.29	721.67	1031.04	0.70	0.0506	0.0015	0.1406	0.0042	0.0199	0.0003	133.6	3.8	127.1	1.7	121.6	3.9
TW3141-1-1-03	25.74	666.29	1023.93	0.65	0.0467	0.0015	0.1312	0.0043	0.0202	0.0003	125.2	3.9	129.1	1.9	124.2	4.0
TW3141-1-1-04	28.47	828.98	1104.29	0.75	0.0516	0.0017	0.1451	0.0054	0.0204	0.0004	137.6	4.8	130.0	2.6	132.4	5.8
TW3141-1-1-05	29.25	746.36	1150.02	0.65	0.0479	0.0014	0.1344	0.0041	0.0202	0.0003	128.0	3.7	128.7	1.7	124.0	3.8
TW3141-1-1-06	18.53	424.43	723.43	0.59	0.0478	0.0015	0.1363	0.0045	0.0205	0.0003	129.7	4.0	130.8	1.8	124.0	4.3
TW3141-1-1-07	35.73	1038.11	1352.88	0.77	0.0477	0.0012	0.1347	0.0038	0.0204	0.0003	128.3	3.4	130.1	2.0	123.9	3.7
TW3141-1-1-08	32.56	859.89	1165.23	0.74	0.0479	0.0014	0.1420	0.0042	0.0214	0.0003	134.8	3.7	136.6	2.0	126.9	4.2
TW3141-1-1-09	22.92	534.71	859.76	0.62	0.0460	0.0016	0.1352	0.0049	0.0212	0.0003	128.7	4.4	135.5	1.9	126.7	4.5
TW3141-1-1-10	20.23	442.70	775.89	0.57	0.0469	0.0016	0.1369	0.0050	0.0211	0.0003	130.3	4.4	134.6	2.2	132.1	4.3
TW3141-1-1-11	18.42	384.62	711.93	0.54	0.0471	0.0018	0.1355	0.0049	0.0211	0.0003	129.0	4.4	134.6	2.2	137.0	5.2
TW3141-1-1-12	20.45	443.38	806.68	0.55	0.0501	0.0015	0.1413	0.0043	0.0204	0.0003	134.2	3.8	130.3	1.8	125.1	4.3
TW3141-1-1-13	17.75	359.53	709.04	0.51	0.0492	0.0019	0.1418	0.0054	0.0208	0.0003	134.6	4.8	132.9	1.9	125.8	4.5
TW3141-1-1-15	16.75	380.91	679.03	0.56	0.0493	0.0020	0.1357	0.0064	0.0198	0.0003	129.2	5.7	126.1	2.1	129.0	6.1
TW3141-1-1-16	19.58	413.38	780.98	0.53	0.0466	0.0015	0.1313	0.0044	0.0203	0.0003	125.2	4.0	129.4	2.0	127.5	4.6
TW3141-1-1-17	20.60	457.21	799.42	0.57	0.0475	0.0016	0.1330	0.0045	0.0202	0.0003	126.8	4.1	128.8	1.8	131.6	4.9
TW3141-1-1-18	26.14	659.14	980.18	0.67	0.0482	0.0017	0.1391	0.0049	0.0209	0.0004	132.2	4.4	133.5	2.6	131.9	5.0
TW3141-1-1-19	20.04	420.59	737.62	0.57	0.0492	0.0016	0.1445	0.0050	0.0210	0.0003	137.1	4.5	134.3	1.8	136.1	4.8
TW3141-1-1-20	25.81	552.80	924.61	0.60	0.0463	0.0015	0.1396	0.0045	0.0217	0.0003	132.7	4.0	138.6	1.9	135.1	4.9
TW3141-1-1-21	21.39	488.07	822.52	0.59	0.0489	0.0017	0.1358	0.0045	0.0201	0.0003	129.3	4.0	128.2	1.7	120.3	3.8
TW3141-1-1-22	26.59	650.52	1011.41	0.64	0.0476	0.0014	0.1323	0.0038	0.0201	0.0003	126.1	3.4	128.1	1.6	120.3	3.8
TW3141-1-1-23	17.54	320.47	675.73	0.47	0.0483	0.0019	0.1386	0.0054	0.0209	0.0003	131.8	4.8	133.3	2.0	126.2	4.7
TW3141-1-1-24	20.57	453.77	786.60	0.58	0.0503	0.0017	0.1413	0.0045	0.0203	0.0003	134.2	4.0	129.5	1.9	121.6	4.6
样品	东部Cutervo地区Oyotún组底部的英安质含角砾强熔结凝灰岩
TW6102-1-1-01	14.10	206.54	416.51	0.50	0.0521	0.0024	0.1645	0.0073	0.0231	0.0004	154.6	6.4	147.1	2.4	158.4	7.7
TW6102-1-1-02	13.58	258.99	425.00	0.61	0.0571	0.0029	0.1667	0.0086	0.0211	0.0004	156.5	7.5	134.6	2.4	145.7	6.1
TW6102-1-1-03	19.85	322.17	629.46	0.51	0.0521	0.0022	0.1601	0.0076	0.0221	0.0004	150.8	6.7	140.7	2.2	150.6	7.1
TW6102-1-1-04	20.02	364.87	672.99	0.54	0.0476	0.0018	0.1411	0.0053	0.0215	0.0003	134.1	4.7	137.4	2.1	135.7	6.3
TW6102-1-1-05	15.06	285.33	434.62	0.66	0.0637	0.0024	0.1834	0.0070	0.0209	0.0003	171.0	6.0	133.6	1.9	157.9	6.4
TW6102-1-1-06	18.11	283.85	589.74	0.48	0.0560	0.0036	0.1627	0.0108	0.0211	0.0004	153.0	9.4	134.6	2.5	157.9	13.0
TW6102-1-1-07	13.90	245.69	453.27	0.54	0.0534	0.0022	0.1545	0.0065	0.0211	0.0003	145.9	5.7	134.3	2.2	146.3	7.0
TW6102-1-1-08	14.57	242.75	478.60	0.51	0.0567	0.0033	0.1683	0.0118	0.0210	0.0004	158.0	10.2	134.3	2.6	147.9	8.7
TW6102-1-1-09	19.76	334.73	634.24	0.53	0.0500	0.0022	0.1477	0.0062	0.0216	0.0004	139.9	5.5	137.8	2.4	148.0	6.3
TW6102-1-1-10	14.92	340.30	415.35	0.82	0.0622	0.0032	0.1878	0.0102	0.0219	0.0005	174.7	8.8	139.7	2.9	170.6	9.1
TW6102-1-1-11	21.24	332.57	666.23	0.50	0.0460	0.0018	0.1378	0.0053	0.0219	0.0003	131.1	4.7	139.4	1.9	146.6	6.0
TW6102-1-1-12	8.28	128.01	253.82	0.50	0.0550	0.0029	0.1667	0.0088	0.0222	0.0004	156.5	7.7	141.7	2.8	153.0	8.1
TW6102-1-1-14	21.15	362.73	639.92	0.57	0.0491	0.0018	0.1528	0.0056	0.0226	0.0004	144.4	4.9	143.8	2.3	153.5	5.5
TW6102-1-1-15	11.80	172.60	375.24	0.46	0.0577	0.0027	0.1724	0.0079	0.0217	0.0003	161.5	6.9	138.7	2.2	151.7	7.1
TW6102-1-1-16	12.40	237.68	381.36	0.62	0.0487	0.0021	0.1496	0.0065	0.0224	0.0004	141.5	5.7	142.8	2.4	136.4	5.6
TW6102-1-1-17	22.18	355.11	741.43	0.48	0.0491	0.0016	0.1503	0.0050	0.0223	0.0003	142.1	4.4	142.1	2.2	138.2	4.7
TW6102-1-1-18	21.40	321.80	683.02	0.47	0.0482	0.0018	0.1509	0.0050	0.0229	0.0004	142.7	4.4	146.1	2.4	146.9	5.2
TW6102-1-1-19	12.55	146.11	430.79	0.34	0.0501	0.0025	0.1561	0.0079	0.0226	0.0004	147.3	7.0	144.2	2.7	138.7	7.5
TW6102-1-1-20	10.34	178.02	326.84	0.54	0.0506	0.0023	0.1537	0.0063	0.0223	0.0003	145.2	5.5	142.0	2.1	139.5	6.4
TW6102-1-1-21	21.87	339.42	758.47	0.45	0.0512	0.0036	0.1563	0.0155	0.0215	0.0003	147.5	13.6	137.4	2.2	153.1	17.4
TW6102-1-1-22	28.69	780.32	847.55	0.92	0.0630	0.0028	0.1860	0.0079	0.0214	0.0004	173.2	6.7	136.3	2.3	119.6	4.7
TW6102-1-1-23	16.95	225.16	605.08	0.37	0.0517	0.0032	0.1600	0.0111	0.0221	0.0004	150.7	9.7	141.0	2.7	151.8	8.6
TW6102-1-1-24	16.46	297.20	504.40	0.59	0.0523	0.0017	0.1683	0.0057	0.0232	0.0004	157.9	5.0	147.6	2.3	153.9	6.0
样品	东部Sammca地区Oyotún组顶部石泡流纹岩
TW6001-1-1-01	14.91	277.38	534.66	0.52	0.0530	0.0038	0.1503	0.0125	0.0201	0.0004	142.2	11.1	128.5	2.6	142.5	7.0
TW6001-1-1-02	22.03	437.01	747.41	0.58	0.0485	0.0020	0.1382	0.0058	0.0204	0.0003	131.4	5.2	130.5	1.8	138.4	5.2
TW6001-1-1-03	21.57	384.93	749.69	0.51	0.0529	0.0025	0.1514	0.0071	0.0207	0.0004	143.2	6.3	131.9	2.3	155.5	6.6
TW6001-1-1-04	14.21	184.07	438.88	0.42	0.0495	0.0023	0.1645	0.0074	0.0240	0.0004	154.6	6.5	152.8	2.4	160.3	7.3
TW6001-1-1-05	15.35	267.92	446.35	0.60	0.0516	0.0023	0.1758	0.0077	0.0248	0.0004	164.5	6.6	157.8	2.7	160.3	8.6
TW6001-1-1-06	19.40	262.77	589.07	0.45	0.0521	0.0031	0.1730	0.0105	0.0238	0.0004	162.0	9.1	151.5	2.3	162.6	7.1
TW6001-1-1-07	22.13	426.57	704.56	0.61	0.0489	0.0034	0.1399	0.0086	0.0209	0.0005	133.0	7.6	133.4	3.3	142.1	7.8
TW6001-1-1-08	10.76	231.96	356.07	0.65	0.0543	0.0036	0.1528	0.0087	0.0209	0.0005	144.4	7.7	133.0	3.2	120.0	6.8
TW6001-1-1-09	13.07	224.34	376.80	0.60	0.0540	0.0033	0.1780	0.0104	0.0242	0.0005	166.4	9.0	153.8	3.2	162.6	8.5
TW6001-1-1-10	12.88	212.93	375.97	0.57	0.0499	0.0023	0.1698	0.0084	0.0245	0.0005	159.2	7.3	156.0	2.8	153.4	7.5
TW6001-1-1-11	31.31	725.51	1050.87	0.69	0.0494	0.0016	0.1407	0.0046	0.0205	0.0003	133.7	4.1	130.6	1.8	123.3	4.0
TW6001-1-1-12	19.55	369.66	657.11	0.56	0.0503	0.0018	0.1455	0.0048	0.0210	0.0003	138.0	4.2	133.9	1.7	129.1	5.0
TW6001-1-1-13	14.90	237.04	439.60	0.54	0.0517	0.0019	0.1738	0.0064	0.0243	0.0004	162.7	5.5	154.7	2.4	152.4	5.2
TW6001-1-1-14	16.57	227.44	494.05	0.46	0.0501	0.0020	0.1738	0.0070	0.0251	0.0004	162.7	6.1	159.6	2.7	150.7	6.7
TW6001-1-1-15	18.01	259.44	603.65	0.43	0.0579	0.0031	0.1688	0.0097	0.0208	0.0004	158.3	8.4	132.9	2.7	158.1	11.0
TW6001-1-1-16	16.75	254.46	505.62	0.50	0.0521	0.0019	0.1786	0.0069	0.0246	0.0004	166.9	5.9	156.8	2.4	149.3	6.0
TW6001-1-1-17	19.72	392.94	675.82	0.58	0.0467	0.0016	0.1349	0.0045	0.0208	0.0003	128.5	4.0	132.7	2.1	131.0	4.5
TW6001-1-1-18	16.02	253.01	434.13	0.58	0.0510	0.0029	0.1762	0.0106	0.0249	0.0006	164.8	9.1	158.3	3.8	181.7	10.3
TW6001-1-1-19	17.15	216.48	523.74	0.41	0.0483	0.0018	0.1682	0.0060	0.0253	0.0004	157.9	5.2	160.8	2.2	154.5	6.4
TW6001-1-1-20	19.97	326.38	593.76	0.55	0.0499	0.0017	0.1691	0.0060	0.0244	0.0004	158.6	5.2	155.5	2.4	156.5	5.8
TW6001-1-1-21	17.36	296.25	502.54	0.59	0.0494	0.0019	0.1698	0.0061	0.0250	0.0004	159.3	5.3	159.1	2.2	148.4	5.2
TW6001-1-1-22	11.41	144.12	363.35	0.40	0.0495	0.0024	0.1660	0.0076	0.0244	0.0004	155.9	6.7	155.3	2.4	149.5	7.4
TW6001-1-1-23	15.70	271.72	453.61	0.60	0.0540	0.0023	0.1817	0.0075	0.0245	0.0004	169.5	6.5	156.0	2.8	154.0	6.7
TW6001-1-1-24	28.72	515.17	1015.30	0.51	0.0473	0.0014	0.1395	0.0044	0.0212	0.0003	132.6	3.9	135.3	1.9	138.5	4.9
样品	东部Pucará地区Oyotún组顶部英安岩
TW4105-1-1-01	10.42	283.37	308.36	0.92	0.0599	0.0049	0.1606	0.0116	0.0200	0.0006	151.2	10.1	127.5	3.7	144.8	11.6
TW4105-1-1-02	4.31	78.49	145.13	0.54	0.0579	0.0030	0.1549	0.0076	0.0201	0.0005	146.2	6.7	128.1	3.3	139.1	9.0
TW4105-1-1-03	9.32	227.27	279.87	0.81	0.0506	0.0025	0.1444	0.0068	0.0211	0.0005	136.9	6.0	134.7	3.4	137.4	7.8
TW4105-1-1-04	5.89	111.66	197.23	0.57	0.0590	0.0034	0.1614	0.0098	0.0201	0.0005	151.9	8.6	128.0	3.0	134.4	8.0
TW4105-1-1-05	5.54	93.69	193.77	0.48	0.0514	0.0026	0.1478	0.0081	0.0206	0.0004	140.0	7.1	131.6	2.7	131.8	7.4
TW4105-1-1-06	5.80	115.41	186.50	0.62	0.0519	0.0026	0.1430	0.0073	0.0201	0.0004	135.7	6.4	128.2	2.5	130.8	7.1
TW4105-1-1-07	4.06	55.63	138.89	0.40	0.0529	0.0040	0.1427	0.0103	0.0206	0.0005	135.4	9.1	131.3	3.3	170.7	11.4
TW4105-1-1-09	3.82	57.57	132.58	0.43	0.0583	0.0040	0.1620	0.0108	0.0205	0.0005	152.5	9.4	130.8	3.0	147.7	9.4
TW4105-1-1-10	10.50	229.24	333.74	0.69	0.0499	0.0025	0.1468	0.0083	0.0210	0.0005	139.1	7.4	134.0	2.9	134.7	6.4
TW4105-1-1-11	7.55	160.39	235.40	0.68	0.0549	0.0033	0.1557	0.0088	0.0209	0.0004	147.0	7.8	133.3	2.7	144.0	7.6
TW4105-1-1-12	3.83	63.97	134.44	0.48	0.0547	0.0039	0.1541	0.0124	0.0209	0.0007	145.5	10.9	133.4	4.1	141.7	12.3
TW4105-1-1-13	10.70	170.61	363.68	0.47	0.0529	0.0029	0.1533	0.0098	0.0206	0.0004	144.8	8.6	131.6	2.5	152.9	7.4
TW4105-1-1-14	6.83	123.90	231.28	0.54	0.0494	0.0031	0.1359	0.0080	0.0205	0.0004	129.4	7.2	130.7	2.8	156.1	9.6
TW4105-1-1-15	4.07	67.47	138.21	0.49	0.0613	0.0044	0.1658	0.0118	0.0204	0.0005	155.7	10.3	130.2	3.3	176.1	13.3
TW4105-1-1-16	8.34	146.11	268.60	0.54	0.0507	0.0026	0.1453	0.0078	0.0211	0.0004	137.7	6.9	134.3	2.4	154.7	8.0
注：Pb^*为放射性成因Pb

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表 2 Oyotún组火山岩主量、微量及稀土元素分析结果

Table 2 Major, trace and rare earth elements abundances of the Oyotún Formation

样品	YH3141	YH3144	YH4105	YH2313	YH6302	YH6104
岩性	英安质含角砾熔结凝灰岩	流纹质角砾熔结凝灰岩	英安岩	英安质晶玻屑凝灰岩	玄武安山岩	英安质含角砾晶屑熔结凝灰岩
SiO₂	63.58	72.33	63.92	60.35	54.44	65.63
A1₂O₃	20.3	13.93	16.12	21.54	17.24	15.14
Fe₂O₃	1.21	0.49	1.91	1.23	3.19	2.34
FeO	1.24	1.9	2.62	4.91	4.72	2.76
CaO	0.34	2.61	3.5	0.4	4.17	1.07
MgO	1.41	0.56	1.6	1.24	3.89	1.55
Na₂O	1.9	3.43	4.53	1.3	3.99	6.07
K₂O	5.53	2.44	2.46	3.02	3.07	1.83
TiO₂	0.85	0.23	0.5	0.84	0.78	0.68
MnO	0.034	0.08	0.12	0.09	0.19	0.13
P₂O₃	0.14	0.056	0.12	0.022	0.22	0.21
烧失量	2.90	1.52	2.10	4.50	3.25	2.16
总量	99.43	99.58	99.50	99.44	99.15	99.57
t_Zr/℃	897	749	764	926	730	790
A/CNK	2.09	1.07	0.98	3.51	0.99	1.09
Cs	7.63	3.56	1.8	7.2	2.1	0.021
Rb	196	154	59.4	102	71	0.600
Ba	1004	330	882	1130	1600	6.600
Th	17.7	15.4	6.5	10.1	4.7	0.080
U	5.02	3.97	1.5	2.2	1.8	0.020
Pb	4.26	8.61	15.8	13.2	13.2	0.150
Ga	23.8	13.6	16.9	24.4	17.8	15.7
Nb	14.4	5.71	5.9	11.7	4.9	0.658
Ta	1.11	0.6	0.44	0.82	0.3	0.037
Sr	108	195	280	231	446	19.900
Zr	301	98	156	301	128	10.500
Hf	8.9	3.4	4.9	7.8	2.1	0.283
Y	27.2	10.4	24.9	14.2	18.8	1205.000
Yb	4.17	1.39	2.6	1.4	2	4.300
Sc	18.1	4.83	14.6	20.5	27.5	16.9
V	67.3	32.3	97.4	60.5	140	33.3
Cr	6.23	14.1	12.9	14.1	29	9.95
Co	4.38	3.2	9.4	6.1	24.2	4.1
Ni	3.09	3.83	4.3	5.5	10	2.42
La	53.2	36.8	34.2	15.8	25.8	53.2
Ce	64.9	60.1	69.9	39	56.8	64.9
Pr	9.52	4.4	6.2	3	5.42	9.52
Nd	35.8	14.4	24.6	11.4	23	35.8
Sm	6.83	2.44	5.4	2.4	5.86	6.83
Eu	1.22	0.63	1.2	0.78	1.35	1.22
Gd	5.15	2.15	4.4	2.2	4.89	5.15
Tb	0.85	0.33	0.8	0.44	1	0.85
Dy	4.8	1.72	4.5	2.7	5.9	4.8
Ho	1.08	0.36	0.92	0.5	1.21	1.08
Er	3.37	1.1	2.6	1.2	3.39	3.37
Tm	0.61	0.2	0.41	0.19	0.55	0.61
Yb	4.17	1.39	2.6	1.4	3.49	4.17
Lu	0.65	0.23	0.38	0.18	0.49	0.65
注：A/CNK=n（Al₂O₃）/n（Ca₂O+Na₂O+K₂O）；t_Zr（℃）为锆石饱和温度^[15]；主量元素含量单位为%；微量和稀土元素单位为10^-6

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表 3 Oyotún组火山岩LA-MC-ICP-MS锆石Hf同位素分析结果

Table 3 LA-MC-ICP-MS zircon Hf isotopes of the Oyotún volcanic rocks

分析点号	年龄/Ma	^l76Hf/^l77Hf	1σ	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Yb/¹⁷⁷Hf	(¹⁷⁶Hf/177Hf)_i	ε_Hf(t)	1σ	T_DM1/Ga	T_DM2/Ga
样品	西部Salas地区Oyotún组顶部英安质晶玻屑凝灰岩
TW2313-0-01	130.63	0.282870	0.000025	0.001750	0.044348	0.282865	6.17	0.863388	0.553681	0.795624
TW2313-0-08	137.17	0.282881	0.000013	0.002113	0.057131	0.282875	6.66	0.460747	0.542873	0.768868
TW2313-0-09	137.31	0.282880	0.000013	0.002112	0.057131	0.282875	6.65	0.469186	0.543725	0.770118
TW2313-0-10	135.60	0.282875	0.000012	0.001881	0.054068	0.28287	6.45	0.43054	0.547723	0.781286
TW2313-0-11	131.63	0.282884	0.000014	0.001505	0.042141	0.28288	6.72	0.486565	0.529008	0.760641
TW2313-0-12	134.96	0.282881	0.000014	0.001748	0.048778	0.282876	6.65	0.481467	0.537374	0.767782
TW2313-0-14	131.53	0.282875	0.000015	0.001500	0.039776	0.282872	6.41	0.537922	0.541647	0.780677
TW2313-0-15	131.56	0.282894	0.000013	0.001464	0.039666	0.282891	7.09	0.455212	0.513751	0.737334
TW2313-0-17	129.55	0.282872	0.000015	0.001676	0.040209	0.282868	6.24	0.515231	0.548842	0.789967
TW2313-0-18	130.06	0.282842	0.000013	0.001098	0.025024	0.282839	5.23	0.441451	0.583267	0.854717
TW2313-0-19	135.61	0.282838	0.000012	0.001517	0.034014	0.282834	5.17	0.41826	0.595656	0.863023
TW2313-0-20	128.02	0.282997	0.000054	0.002044	0.044969	0.282992	10.59	1.886737	0.371932	0.509681
TW2313-0-21	128.17	0.282935	0.000016	0.001838	0.039629	0.28293	8.42	0.548119	0.460169	0.649516
TW2313-0-22	133.13	0.283115	0.000017	0.001744	0.035874	0.283111	14.91	0.584267	0.196612	0.235072
样品	西部Badangrande地区Oyotún组顶部英安质含角砾晶屑熔结凝灰岩
TW3141-1-1-1	127.44	0.282832	0.000018	0.002301	0.059538	0.282827	4.74	0.63094	0.616693	0.884387
TW3141-1-1-10	134.58	0.282903	0.000015	0.001640	0.041430	0.282899	7.45	0.527908	0.503454	0.716631
TW3141-1-1-11	134.61	0.282854	0.000016	0.001552	0.039823	0.28285	5.72	0.565144	0.572882	0.827121
TW3141-1-1-12	130.29	0.282870	0.000017	0.001495	0.036754	0.282866	6.18	0.595266	0.549709	0.794137
TW3141-1-1-13	132.90	0.282878	0.000015	0.001070	0.027721	0.282875	6.57	0.531822	0.531891	0.771838
TW3141-1-1-15	126.09	0.282856	0.000016	0.001999	0.050297	0.282851	5.55	0.564635	0.577909	0.831204
TW3141-1-1-16	129.41	0.282878	0.000016	0.001311	0.033417	0.282875	6.48	0.577113	0.534778	0.774306
TW3141-1-1-17	128.85	0.282881	0.000017	0.001653	0.044177	0.282877	6.55	0.579009	0.535266	0.769499
TW3141-1-1-18	133.51	0.282883	0.000017	0.001428	0.035481	0.28288	6.74	0.577784	0.529176	0.761135
TW3141-1-1-19	134.26	0.282854	0.000015	0.001280	0.033278	0.282851	5.73	0.52001	0.569179	0.82652
TW3141-1-1-2	127.07	0.282852	0.000013	0.001706	0.042570	0.282848	5.46	0.448814	0.578899	0.837831
TW3141-1-1-20	138.56	0.282927	0.000017	0.002354	0.057633	0.282921	8.30	0.582034	0.478694	0.665234
TW3141-1-1-21	128.20	0.282853	0.000013	0.001234	0.032290	0.28285	5.58	0.455062	0.569592	0.831499
TW3141-1-1-3	129.14	0.282874	0.000012	0.001782	0.045151	0.282869	6.28	0.4108	0.548069	0.787101
TW3141-1-1-4	130.04	0.282889	0.000014	0.001203	0.029206	0.282886	6.88	0.498611	0.518267	0.749619
TW3141-1-1-5	128.67	0.282877	0.000013	0.001764	0.043895	0.282873	6.40	0.467102	0.542529	0.779024
TW3141-1-1-6	130.83	0.282840	0.000014	0.001193	0.029772	0.282837	5.18	0.474888	0.587195	0.858677
TW3141-1-1-7	130.12	0.282880	0.000014	0.001365	0.034096	0.282876	6.55	0.504612	0.533374	0.770753
TW3141-1-1-8	136.61	0.282876	0.000015	0.001450	0.036197	0.282873	6.55	0.519941	0.539554	0.77539
TW3141-1-1-9	135.46	0.282842	0.000015	0.001399	0.035025	0.282838	5.32	0.529693	0.588187	0.85364
样品	东部Pucará地区Oyotún组顶部英安岩
TW4105-1-01	127.51	0.282861	0.000012	0.001458	0.037827	0.282858	5.83	0.43157	0.5612	0.814478
TW4105-1-02	128.06	0.282913	0.000013	0.001312	0.035345	0.28291	7.68	0.464745	0.485096	0.696468
TW4105-1-03	134.74	0.282827	0.000013	0.002045	0.055302	0.282822	4.72	0.445964	0.620234	0.891289
TW4105-1-04	128.00	0.282928	0.000016	0.001397	0.038379	0.282925	8.22	0.566403	0.463996	0.661882
TW4105-1-05	131.65	0.282848	0.000014	0.001592	0.041696	0.282844	5.44	0.494427	0.582488	0.843101
TW4105-1-06	128.21	0.282868	0.000015	0.001114	0.029143	0.282865	6.12	0.522545	0.546358	0.796807
TW4105-1-07	131.26	0.282839	0.000016	0.000970	0.024697	0.282837	5.18	0.555711	0.585019	0.859282
TW4105-1-09	130.85	0.282837	0.000017	0.001293	0.032424	0.282834	5.05	0.594221	0.593578	0.866824
TW4105-1-10	133.97	0.282852	0.000016	0.001413	0.035580	0.282849	5.66	0.553907	0.573278	0.830693
TW4105-1-11	133.26	0.282859	0.000014	0.001651	0.043547	0.282855	5.86	0.502542	0.567421	0.817479
TW4105-1-12	133.42	0.282847	0.000013	0.001153	0.029785	0.282844	5.47	0.471085	0.577234	0.842147
TW4105-1-13	131.57	0.282904	0.000014	0.001910	0.047569	0.282899	7.39	0.493477	0.50605	0.718085
TW4105-1-14	130.74	0.282860	0.000015	0.000926	0.023357	0.282858	5.90	0.53198	0.554964	0.812417
TW4105-1-15	130.20	0.282833	0.000014	0.001221	0.030371	0.28283	4.90	0.481507	0.59856	0.8765
TW4105-1-16	134.31	0.282908	0.000015	0.001670	0.044439	0.282904	7.61	0.51179	0.496741	0.705793
样品	东部Cutervo地区Oyotún组底部英安质含角砾熔结凝灰岩
TW6102-1-1-01	147.13	0.282796	0.000014	0.001276	0.031580	0.282792	3.94	0.495904	0.652311	0.950829
TW6102-1-1-02	134.64	0.282817	0.000012	0.002021	0.051607	0.282812	4.38	0.407262	0.634025	0.913201
TW6102-1-1-03	140.70	0.282858	0.000014	0.001531	0.037338	0.282854	5.98	0.487984	0.56734	0.815394
TW6102-1-1-04	137.41	0.282843	0.000012	0.001175	0.029727	0.28284	5.41	0.417009	0.583385	0.849211
TW6102-1-1-05	133.58	0.282818	0.000015	0.001556	0.037616	0.282814	4.42	0.530536	0.625194	0.909777
TW6102-1-1-06	134.64	0.282828	0.000013	0.001580	0.039213	0.282824	4.79	0.438641	0.611114	0.886601
TW6102-1-1-07	134.33	0.282812	0.000016	0.001539	0.037972	0.282809	4.24	0.560048	0.632796	0.921668
TW6102-1-1-08	134.27	0.282843	0.000022	0.002044	0.048664	0.282838	5.28	0.75417	0.596789	0.855217
TW6102-1-1-09	137.75	0.282834	0.000016	0.001977	0.049853	0.282829	5.05	0.550882	0.60825	0.872449
TW6102-1-1-10	139.71	0.282864	0.000020	0.002823	0.067826	0.282856	6.05	0.686193	0.578836	0.809918
TW6102-1-1-11	139.43	0.282826	0.000016	0.002952	0.075784	0.282818	4.70	0.575494	0.637378	0.896162
TW6102-1-1-12	141.67	0.282858	0.000015	0.001822	0.047776	0.282853	5.97	0.510728	0.571839	0.816604
TW6102-1-1-14	143.76	0.282840	0.000013	0.002077	0.052678	0.282834	5.34	0.464815	0.602571	0.858442
TW6102-1-1-15	138.66	0.282820	0.000015	0.001111	0.027350	0.282818	4.65	0.509511	0.614131	0.898559
TW6102-1-1-16	142.81	0.282889	0.000019	0.002036	0.048606	0.282884	7.08	0.653384	0.529697	0.746701
TW6102-1-1-17	142.09	0.282857	0.000012	0.001779	0.044691	0.282852	5.94	0.436694	0.573019	0.819015
TW6102-1-1-18	146.13	0.282798	0.000012	0.001278	0.030887	0.282794	3.99	0.432847	0.649203	0.946442
TW6102-1-1-19	144.22	0.282824	0.000015	0.001709	0.042431	0.28282	4.85	0.530449	0.61842	0.890148
TW6102-1-1-20	141.95	0.282785	0.000017	0.002059	0.049110	0.282779	3.37	0.609108	0.682329	0.983319
TW6102-1-1-21	137.43	0.282814	0.000015	0.001443	0.034954	0.28281	4.36	0.51291	0.629236	0.916346

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秘鲁西北部早白垩世Oyotún组火山岩层序、年代学及地球化学特征——对古Farallon板块俯冲作用细节的揭示

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Sequence, age and geochemistry of volcanic rocks of the Early Cretaceous Oyotún Formation in northwestern Peru: Revelation for the details of paleo-Farallon subduction

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