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  • More on the morphological characteristics and systematic texology of genus Longfengshania Du, 1982 (Magascopic Alga)
    NIU Shaowu
    The fossil bodies of Longfengshania are composed of the tow part with foliate and sub-leafstalk fixed organs, and thus the author considers that the genus represents the fossils of marine sessile multicellular Mataphyta with possible relationships to the Phaeophyta and Chlophyta. According to the morphological characteristics, biogenetic law and palaeoecology, the algal body of genus Longfengshania Du is composed of three parts with blade, stripe and holdfast, belonging to Phyllum Phaeophyta, Order Laminariales, Family Longfengshania ceae. The initial solution of systematic texology of genus Longfengshania Du is of important significance in the study of biology and palaeontology.
    2019  .  38(8):    1259-1265    [摘要](22)    [PDF]()
  • The burial features and age of the newly discovered Nothosaur in Guojiawan area, southwestern Guizhou Province
    XIANG Kunpeng, HE Yongzhong, ZHAO Lei, AN Yayun, LIU Kuiyong, HE Ben and PAN Yingjuan
    Through the 1:50000 regional geological survey, a new nothosaur fossil site was discovered in Guojiawan area, southwestern Guizhou Province. Based on the field section measurement, the short-distance burial characteristics of the fossils were analyzed in detail,and the age was considered to be Middle Triassic Anisian Stage according to the regional geological mapping and fossil data. Combined with the distribution and the paleogeographic characteristics of the Anisian Stage biotas in the west of Guizhou Province and its adjacent areas, the authors analyzed the possible source. The result shows that Guojiawan area was the possible living place of the nothosaur. The discovery of the nothosaur and its age provides new material and evidence for the evolution and migration of Triassic Marine reptiles, and hence has important scientific significance.
    2019  .  38(8):    1266-1273    [摘要](34)    [PDF]()
  • The genesis of Jitang duplex granites in east Tibet: Evidence from the zircon UPb age and rock geochemistry
    FAN Bingliang, ZHANG Xinli, YU Tao, BAI Tao and FENG Dexin
    Jitang duplex granites are located in the northern section of the Lancang River magma belt, and serve as an important window for studying the evolution process of Lancang River juncture zone. In this paper, the LA-ICP-MS zircon U-Pb chronology and rock geochemistry of biotite monzonitic granite and granitic diorite in Jitang duplex granites of Kakagong area along northern Lancang River were studied. The results show that the selected zircon samples exhibit obvious growth ring zone, the Th/U ratio is generally higher than 0.4, and the typical magma zircon has average weighted 206Pb/238U age of 222.8±1.5Ma (MSWD=1.60, n=16), 213.6±1.1Ma (MSWD=0.98, n=20) and 221.1±1.5Ma (MSWD=1.30, n=15), suggesting Late Triassic. The geochemical characteristics of rocks show that the Jitang biotite monzonitic granite and granitic diorite have relatively consistent content of main and trace elements, and their changing characteristics are also consistent. It is shown that these two kinds of rocks might have been derived from the same magma, and the Jitang duplex granites belong to the aluminum S-type granite, which has the same petrogeochemical properties as Lincang granite and Newcastle granite, and has a unified tectonic magmatic activity mode along the Lancang River granite belt. The formation of Jitang duplex granites was related to the thickening and warming of the crust and the deep melting effect related to the shearing and stretching period of lithosphere, with the closure time of Lancang Jiang Ocean was probably at about 273Ma.
    2019  .  38(8):    1274-1286    [摘要](26)    [PDF]()
  • Ordovician island arc volcanic rocks in Halahu area of Qilian Mountain and their tectonic significance
    LI Wufu, ZHANG Xinyuan, WANG Chuntao, LIU Jiandong, QIAO Guodong, KUI Mingjuan, LI Honggang, ZHAO Zhongguo, XUE Wanwen and LI Shanping
    Based on 1:50000 regional geological survey, the authors studied volcanic rocks of Hulahu area in Qilian Mountain in the aspects of field geology, petrology, geochronology and geochemistry. Zircon LA-ICP-MS U-Pb dating results show that the Halahu volcanic rocks were formed in Middle Ordovician (466.3 ±2.4Ma, MSWD=1.4). Geochemical data show that the Halahu volcanic rocks belong to low-K tholeiite series, and are characterized by enrichment of LILEs (Rb, Th, U, Ce, Zr and Nd) and LREEs and depletion of Sr, P, Ti and Ba. On the whole, a few samples have features similar to those of T-MORB, but most samples show affinities with island arc related to subduction. In addition, the Halahu volcanic rocks were associated with Late Ordovician arc granitoids. These features indicate that the island arc rocks were associated with Ordovician paleo-oceanic closure in Lajishan area.
    2019  .  38(8):    1287-1296    [摘要](26)    [PDF]()
  • The formation age and tectonic significance of Yemuqi granite in West Junggar, Xinjiang
    WEN Zhigang, WANG Hongqiang, DU Yao, LIU Songbai and WANG Jiawei
    In this paper, the petrology, lithogeochemistry, and isotope chronology of Yemuqi granite closely associated with Early Paleozoic granite in the southern part of West Junggar, Xinjiang, were studied in detail. It is considered that the granite belongs to low potassium (tholeiitic) series. The rock geochemistry shows the characteristics of the intraplate close to island arc region. The authors obtained accurate age data of 539.7±2.6Ma by LA-ICP-MS zircon U-Pb dating of the monzonite granite. It is shown that the age of its formation was Early Cambrian. The intrusive rock is the oldest product of magmatic activity in the West Junggar area, which represents the geological record of the early stage of the splitting in the Early Paleoceanic Basin after the formation of the united continent of Nodingnia.
    2019  .  38(8):    1297-1305    [摘要](15)    [PDF]()
  • LA-ICP-MS zircon U-Pb dating of dikes in the Dajing copperpolymetallic deposit and a discussion on the metallogenic epoch
    LIU Mingtao, LIU Jianming, XUE Chunji, CHEN Xiangping, CHEN Zhiguo and FENG Baoshan
    The Dajing deposit was previously regarded as a magmatic hydrothermal type deposit.The orebodies are controlled by the NW-and NWW-trending faults and occur in Permian Linxi Formation. The zircon samples collected during the research were dated by using LA-ICP-MS zircon U-Pb method, and the authors obtained the following results:the zircon U-Pb ages are 164.1±0.8Ma (MSWD=0.60, n=16) and 253.8 ±1.1Ma (MSWD=0.96, n=14) for felsite dikes and andesite porphyry dikes, respectively. Felsite dikes were formed in a collisional setting probably related to the closure of Mongolia-Okhotsk Ocean and post collision, while andesite porphyry dikes were formed in a tectonic setting possibly related to the collision between Siberian Plate and North China Plate. Based on the zircon U-Pb ages of dikes obtained, the authors have reached the conclusion that the ore-forming process of the Dajing polymetallic deposit occurred later than 164Ma. The most intense volcanic-magmatic activities of the Da Hinggan Mountains took place during Middle Yanshanian period. It is therefore held that the ore-forming process of the Dajing polymetallic deposit occurred approximately in Late Jurassic-Early Cretaceous.
    2019  .  38(8):    1306-1313    [摘要](15)    [PDF]()
  • Geochemical characteristics and zircon U-Pb ages of porphyroclastic lava in the Bayaerhushuo area, the south-central segment of Great Xing'an Range, and its geological significance
    SHEN Liang, ZHAO Shengjin, YU Haiyang, LIU Zhihui, ZHOU Yingshuai, SU Jianguo, YANG Haixing and GAO Lidong
    The porphyroclastic lava is located in the Bayaerhushuo area, the south-central segment of Great Xing'an Range, which can be divided into two parts, the central facies of fine-grained quartz monzonites (-quartz monzonitic porphyry) and the margin facies of dacitic rhyolitic porphyroclastic lava. Based on the SHRIMP zircon U-Pb dating, the porphyry monzonitic granite and dacitic ryholititic porphyroclastic lava samples yielded U-Pb ages of 137.4±0.9Ma (MSWD=1.13) and 135.2±0.8Ma (MSWD=1.17) respectively, indicating that the porphyroclastic lava samples in the study area were formed during the Early Cretaceous. The results of geochemical analyses show that the six samples are all high-K calc-alkaline A-typed granites and have the same characteristics in the trace element spidergrams and REE patterns. The features of evident negative Eu anomaly, enrichment in the LILEs Rb and Pb, LREE and Th, depletion in HFSE Nb, Ba, Sr and Eu, reveal that these samples may originate from the partial melting of crust. By tectonic environment discriminations, the porphyroclastic lava are plotted into the A2-typed granite,revealling the post-collisional extension environment. Combined with the Mesozoic tectonic evolution of the Great Xing'an Range, the formation of the Early Cretaceous porphyroclastic lava should be related to the lithospheric extensional envrinment caused by the closure of MongoliaOkhotsk ocean.
    2019  .  38(8):    1314-1326    [摘要](18)    [PDF]()
  • U-Pb ages of zircon from metamorphic dolomite of the Wuliangshan Rock Group in Nanjian area, western Yunnan, and its tectonic significance
    LIU Junping, HU Shaobin, TIAN Sumei, LU Xiaoping, SUN Baidong, YU Saiying, ZHU Xunzao, SUN Peng and WANG Xiaofeng
    The Wuliangshan Rock Group, which is widely exposed in the Nanjian-Yunxian area of western Yunnan, is a set of low and medium metamorphic sedimentary rocks intercalated with volcanic rocks closely related to the Sanjiang Tethys orogenic belt. Its formation age, sedimentary filling sequence and tectonic attributes have been controversial. The Wuliangshan Rock Group, exposed in Gonglong County and Nanjian County, has a metamorphic ananite intercalation several centimeters thick. The zircon U-Pb LAICP-MS dating of the metamorphic andesite Sample was carried out, and the magmatic crystallization age of 428.7±8.7Ma and the metamorphic age of 338~387Ma, 250.5 ±8.1Ma and 146.0 ±6.0Ma were obtained respectively. It is considered that the original sedimentary rocks of the Wuliangshan Rock Group were formed in Silurian and experienced regional metamorphism in the Palaeozoic arc forming process during the Paleo-Tethys Ocean subduction and thermal metamorphism in the Cretaceous period due to thermal events. At the same time, the single grain ages of 2034±22Ma, 1140±16Ma, 731±15Ma and 469~522Ma were obtained, which can be compared with the Precambrian, Paleozoic tectonic caloric event ages and distribution characteristics obtained from the western margin of the Yangtze block. It underwent the formation and breakup of Columbia, Rodinia and Gondwana supercontinent.
    2019  .  38(8):    1327-1334    [摘要](21)    [PDF]()
  • SHRIMP U-Pb zircon dating of clastic sedimentary rocks of the Guandu Group, Zanhuang Complex, Hebei Province, and its geological significance
    ZHANG Fan, WANG Yanbin, YANG Chonghui, DU Lilin and YUAN Hongqing
    The Neoarchean-Paleoproterozoic supercrustal rocks as well as the Guandu Group from Zanhuang Complex have been widely reported in the whole North China Craton. The formation age and the environment of the Guandu Group are still controversial. Zircon SHRIMP U-Pb data of clastic sedimentary rocks of the Guandu Group, combined with previously available detrital zircon data, reveal that the majority of detrital ages are at~2.5Ga, with 2.0~2.2Ga peak for some samples. At least two metamorphic events were recorded, i.e.,~2.48Ga and 1.85~1.9Ga. Based on data obtained in this study as well as other studies of the Zanhuang Complex in recent years, some conclusions can be drawn as follows:① The well-preserved elongate prismatic morphology of some zircons implies that the source of depositional materials was not far away; ② The~2.48Ga metamorphic record is so close to the crystallization age of inner cores of zircons (~2.5Ga), probably suggests the existence of metamorphism that happened soon after the formation of the igneous rocks before the deposition of Guandu Group rocks, i.e., the deposition happened after~2.48Ga; ③ At least part of the Guandu Group was formed in Paleoproterozoic instead of late Archean; ④ The Guandu Group was probably not a continuous stratigraphic unit, but was composed of lithological units formed in different epochs and environments, and it thus should be disintegrated.
    2019  .  38(8):    1335-1343    [摘要](8)    [PDF]()
  • The characteristics of ore-controlling fault and its relationship to uranium mineralization in Shangwei area, Southern Jiangxi Province
    DANG Feipeng, FAN Zheqing, LI Zhipeng, CHEN Liming, CAI Changhua, HUANG Chao and CHEN Xin
    Shangwei area is in southernmost Longnan County, Jiangxi Province. The Yanshanian Shangwei granite complex pluton is strictly controlled by NE-trending Mashishan fault zone and Exing fault and occurs in the NE-trending oval form. It is a uraniumbearing granite body, where there exist known uranium deposit No. 291 and No. 292 uranium ore spot. Due to strong faulting, alterations and mineralizations are abundant in main fault belts. Geological survey reveals that the fracture tectonic system in Shangwei area is mainly formed by 6 NE-trending faults, 11 NNE-trending faults and some NW-NWW trending faults. The NE-and NNEtrending faults include silicified fault (QF3, QF4), quartz fault (QF7~QF9), silicified fractured fault (QF1, QF2, QF5 and QF6) and altered cataclastic fault (F1, F2, F3 and F7). The NW-trending fault is usually filled with intermediate basic veins (501~504). NNE-trending faults are intimately related to uranium mineralization, and are thus the main ore-bearing faults. Uranium orebody occurs within the NNE-trending faults and bears a close relation to silicified breccia and cataclastic altered rock. The attitude of NNE-trending fault controls the dip of the orebody, its property controls the mineralization types, the deformation behaviour controls the horizontal zoning characteristics of mineralization and alternation, and the fault and the veins obviously control the shape of rich uranium orebody.
    2019  .  38(8):    1344-1351    [摘要](15)    [PDF]()
  • ircon U-Pb age, geochemistry and geological significance of Shunzuo granite in Wuzhishan area, Hainan Island
    WANG Chao, WEI Changxin, YUN Ping, Lü Changyan, Lü Zhaoying and MENG Zhongying
    Shunzuo granite is located in the Wuzhishan area of Hainan Island, on the east and west sides of the Cretaceous volcanic rocks. The LA-ICP-MS zircon U-Pb dating yielded an age of 254.4±2.4 Ma, suggesting Late Permian. Petrology and geochemistry show that it belongs to the sub-alkaline rock series, with SiO2 content 69.88%~74.51%, 72.99% on average, implying an acidic rock. It has obvious negative anomalies of Ba, Ta-Nb, P and Ti and obvious positive anomalies of Rb, K, Pb and Nd. The initial strontium ratio is 0.70947~0.717388, which is lower than the average ratio of strontium to continental rock (0.719), suggesting moderate strontium granite. εNd(t) is-9.25~-5.14, and T2DM is 1444~1777Ma. It might have resulted from the action of crust thickening in the deep melts and NW-SE trending extrusion on slate, phyllite, plagiogneiss, granulite, plagioclase diopside and other rocks or deeper similar rocks, being a product of stress synergy. It is S-type granite, and the emplacement is a strong emplacement type in the syn-collision structure environment. It is of the hot air balloon expansive type underplating. It belongs to the shell source remelting granite, which was formed in the syn-collision environment.
    2019  .  38(8):    1352-1361    [摘要](23)    [PDF]()
  • The molybdenite Re-Os dating and genesis of the Kaladawan iron deposit, Ruoqiang, Xinjiang
    WU Bin, WANG Aiguo, ZHANG Chuanlin, BAO Xiaoming, YE Xiantao and NI Kang
    The Kaladawan iron deposit was discovered in the Arkin area in recent years. It is a superlarge iron deposit with controlled reserves of nearly 100 million tons, and characterized by high grade, low sulfur and low phosphorus. Due to the particularity of the surrounding rocks of the deposit, there has been a big controversy on the genesis of the deposit. In this paper, the Re-Os isotopic dating method was used to determine the metallogenic epoch of the five molybdenite samples from the Kaladawan orebody, and the molybdenite Re-Os isotopic model age is 490±11Ma, isochron age is 481.9±7.6Ma. Both are basically consistent within the error range. The ages coincide with the SHRIMP U-Pb ages of the mineralization-related rock of 488±5Ma and 479±4Ma, and there is also diorite exposed near the orebody, which shows close relationship between petrogenesis and mineralization. Combined with petrology, mineralogy and chronological characteristics, the authors hold that the Kaladawan iron deposit is a skarn deposit.
    2019  .  38(8):    1362-1368    [摘要](10)    [PDF]()
  • Zircon U-Pb age of intrusive rocks and molybdenite Re-Os age for Lianzigou Au deposit in Xiaoqinling area and its geological significance
    DAI Junzhi, GAO Jusheng, QIAN Zhuangzhi, WANG Yuan, ZHOU Jinlong and GAO Yi
    The Lianzigou gold deposit is located in the west of Xiaoqinling Au ore concentration area. The orebodies are hosted in the upper strata of Taihua Group and controlled by fault fracture zone or quartz veins. The wall rock alteration is dominated by potassium alteration and silicification. Au (Mo) orebodies have been discovered in the depth of the deposit. To constrain its petrogenic and metallgogenic ages, the authors carried out LA-ICP-MS zircon U-Pb dating on syenite porphyry and Re-Os dating on molybdenite, respectively. LA-ICP-MS zircon U-Pb dating of syenite porphyry gave a weighted average age of 1802.9±9.9Ma, which is clearly older than the age of large-scale gold mineralization in the Xiaoqinling area. Re-Os dating on molybdenite from the Au orebodies gave an isochron age of 128.8±6.5Ma, indicating that the Au and Mo mineralization occurred in Early Cretaceous. The Re-Os age is younger than the petrogenic ages of granites in the Xiaoqinling area, showing that there is no direct relationship between the known granitic magmatism and the mineralization of the Lianzigou Au deposit. Deep fluids or concealed magmatic intrusion probably played an important role in mineralization.
    2019  .  38(8):    1369-1377    [摘要](11)    [PDF]()
  • Genetic model of Gujishan anticline geothermal system and prediction of potential areas in Western Hills of Beijing
    KE Bailin, LIN Tianyi, LI Wen, YANG Miao, LIU Qing, LIU Aihua and ZHAO Lianhai
    There is no natural hot spring outcropped in the uplift area of Beijing Western Hills (Xishan). In the past several years, geothermal water temperatures ranging from 40℃ to 49℃ were discovered through drilling of thermal water boreholes one after another in Gujishan anticline. However, the research on geothermal origin has not been carried out yet. Geological, hydrogeological and geochemical studies show that hot rock reservoir is the karst fissure water developed in dolomite rock of Wumishan Group, Jixian System. The water geochemical type is HCO3-Ca·Mg, neutral-to-weakly alkaline, micro hardness and fluorine fresh geothermal mineral water, which is named Xishan Gujishan geothermal field primarily. In this paper, the authors put forward the geothermal genetic model, and the analytical results show that the heat source is the radioactive element decay heat from the concealed acid granite pluton at the deep dome in Yanshanian period. It is of the layer carbonatite hot reservoir type located in uplifted mountain area different from the common geothermal systems of convective type developed in heat conducting faults. Based on dome structure and Yanshanian magma characteristics, the authors preliminarily predict that the domes like Xiaweidian dome in Beijing Western Hills have conditions for the formation of geothermal system, and they can be regarded as the advantage potential areas.
    2019  .  38(8):    1378-1385    [摘要](15)    [PDF]()
  • REE resources potential in Greenland and the availability evaluation in favor of China
    LIU Qingping, ZHAO Yuanyi and LIU Chunhua
    Located in the North Pole, Greenland is the world's largest island. After about four billion years of geological evolution, Greenland has been extremely rich in mineral resources, especially with heavy rare earth elements as the characteristics of the rare earth mineral resources. The previous researchers mainly concentrated their attention on ferrous metal and polymetallic mineral resource, with very insufficient attention paid to the rare earth metal resource. In order to protect the limited rare earth resources and provide basic information for Chinese enterprises' and geological exploration organizations' implementation of "going out" policy in Greenland with the purpose of seeking for potential REE resources, the authors, through the collection of literature and online information, found that the rare earth mineral deposits are mainly concentrated in southwest, south, east, and west of Greenland, and the types of these resources include mainly a carbonate rocks type, a alkaline rocks type, a paleo-placer type, and a possible IOCG type. The REE potential of Greenland is great. The four potential regions were determined by analysis of geological data from Greenland, which include two classⅠprospect, one class Ⅱ prospect and and one class Ⅲ prospect. The next step should focus on the potential area of southern and southwest Greenland two classⅠprospects, followed by the work in the middle east class Ⅱ prospect and the middle west class Ⅲ prospect. From various aspects of Greenland's rare earth mineral resources utilization, the authors consider that the REE deposits in Greenland deserve Chinese enterprises' much attention.
    2019  .  38(8):    1386-1395    [摘要](11)    [PDF]()
  • Thoughts on promoting the exploitation and utilization of geological data in China
    WANG Bin, LI Jingchao, WANG Chengxi, DING Keyong, LIAN Jian and LIANG Wanjuan
    Remarkable achievements in the geological data service have been made in the past twenty years in China. However, the exploitation and utilization of geological data remain at the start stage and have some prominent problems, such as backward exploitation consciousness, few regulations and technical standards, slow marketization, lacking intellectual property protection, less products and methods, and unmatched relationship between supply of product and demand of user. Based on the basic properties of geological data, this paper discusses the scientific value, economic value, cultural value and historical value of the exploitation and utilization of geological data. Researches show that the further geological data exploitation and utilization work has the following characteristics:development of marketization, resource sharing, technological informationization, carriers diversity, and products commodification. It also follows certain development processes and methods. As for promoting better geological data development and utilization in China and accelerating marketization process, this paper has also given its own opinions:improving policies and technical standards system, enriching resources, drafting planning, strengthening informatization construction, broadening exploitation content, promoting marketization, handling the relationship between confidentiality and utilization, transforming concept and some other measures.
    2019  .  38(8):    1396-1402    [摘要](13)    [PDF]()
  • 任纪舜
    2019  .  38(8):    1403-1404    [摘要](11)    [PDF]()

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