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王志龙,胡西冲,石晓龙,黄强太,郑浩,师胜梅.西藏窝若巴勒-白龙地区阿布山组沉积岩石、地球化学特征及碎屑锆石对物源信息的指示意义[J].地质通报,2017,(7):1188-1203.
西藏窝若巴勒-白龙地区阿布山组沉积岩石、地球化学特征及碎屑锆石对物源信息的指示意义    点此下载全文
王志龙1  胡西冲2  石晓龙3  黄强太4  郑浩4  师胜梅5
1. 清远市建设工程质量检测站, 广东 清远 511515;
2. 海岛保护与利用研究中心/国家海洋环境监测中心, 辽宁 大连 116023;
3. 广州市地质调查院, 广东 广州 510440;
4. 海洋石油勘探开发广东省普通高校重点实验室, 广东 广州 510006;
5. 广东省有色金属地质局九四 O队, 广东 清远 511520
基金项目:中国地质调查局项目《西藏窝若巴勒地区1:5万区域地质矿产调查》(编号:1212011221088)和《西藏白龙地区1:5万区域地质矿产调查》(编号:1212011221087)
DOI:
摘要:
      在白龙地区和窝若巴勒地区1:5万区域地质矿产调查中,根据阿布山组的野外岩石及沉积特征,将阿布山组分为上、下2段,分别为山前河流和湖泊相沉积。该组上段砂岩的地球化学特征显示,物源主要来自上地壳,且主要为长英质岩石。对阿布山组上段的砂岩层进行碎屑锆石采样,从该组的2个样品中得到的最年轻的碎屑锆石年龄分别为85.9Ma和100.39Ma,为该组的时代归属提供了依据。同时,2组样品存在110Ma、440Ma、820Ma、1280Ma四期年龄峰值,结合该组的岩石地球化学特征及物源信息,对羌塘地体的构造演化做了一定的探讨。
关键词:阿布山组  羌塘地块  地球化学特征  物源信息  碎屑锆石
Sedimentary rocks and geochemical characteristics as well as detrital zircon of Abushan Formation in Woruobale and Bailong area, Tibet, and their indicating significance for prove-nance information    Download Fulltext
WANG Zhilong1  HU Xichong2  SHI Xiaolong3  HUANG Qiangtai4  ZHENG Hao4  SHI Shengmei5
1. Qingyuan Construction Quality Inspection Station, Qingyuan 511515, Guangdong, China;
2. Island Protection and Utilization Research Center, National Marine Environmental Monitoring Center, Dalian 116023, Liaoning, China;
3. Guangzhou Institute of Geology Survey, Guangzhou 510440, Guangdong, China;
4. Guangdong University Key Laboratory of Offshore Oil Exploration and Development, Guangzhou 510006, Guangdong, China;
5. 940 Nonferrous Geological Team, Qingyuan 511520, Guangdong, China
Fund Project:
Abstract:
      From the 1:50000 regional geological and mineral survey of Bailong and Woruobale area, and on the basis of the field rock and sendimentary characteristics, the authors divided the Abushan Formation into two sections, i.e., piedmont alluvial and lacus-trine facies clastic sediments. Geochemical characteristics of the sandstone samples from the upper Abushan Formation show that the provenance was mainly from the upper crust, and was mainly felsic rocks. The authors obtained for the first time two detrital zircon samples from Upper Abushan Formation, and the analytical results show that the youngest detrital zircon ages are 85.9Ma and 100.39Ma. The results provide a basis for determining the ages of Abushan Formation. In addition, there exist four peak ages for the two samples, i.e., 10Ma, 440Ma, 820Ma and 1280Ma. Combined with the geochemical characteristics and provenance information of this group, the authors made a discussion on the tectonic evolution of Qiangtang terrane.
Keywords:Abushan Formation  Qiangtang terrane  geochemical characteristics  provenanace information  detrital zircon
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