U-Pb Ages of the Late Early Cretaceous Magmatic Rocks  in the Zhalantun Area of Inner Mongolia     

QIN Tao  LI Linchuan  QIAN Cheng  SUN Wei  MA Yongfei  ZANG Yanqing 《《地质学报》英文版》2019,93(1):233-235

A great deal of early-to-mid Early Cretaceous magmatic activities have been recorded in the Zhalantun area of Inner Mongolia,while the late Early to Late Cretaceous magmatic rocks have been barely reported(Guo et al.,2018;Zhang Xiangxin et al.,2017).At present,only a few Late Cretaceous magmatic activities were reported in the Arongqi area,such as volcanic rocks of the Gushanzhen Formation.However,the Gushanzhen Formation lacks accurate isotopic age,and contemporaneous intrusive rocks has not been reported yet.In this work,we collected the volcanic rocks from the Gushanzhen Formation and contemporaneous intrusive rocks in the Zhanlantun and nearby,and aim to figure out the formation ages of volcanic rocks of the Gushanzhen Formation and accompanied intrusive rocks by analyzing zircon U-Pb isotopes(Fig.1).  相似文献   

Early Permian Strata Exist in the Olongbluk Block     

SUN Jiaopeng  JIANG Wan  MA Licheng  XIAO Zhouxuan 《《地质学报》英文版》2019,93(2):481-482

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Weak Summer Monsoon during the Early Holocene Inferred from the Dingxi Lujiagou Floodplain Lake-Eolian Sand Rhythm due to Solar Impacting     

ZHANG Wanyi  ZHANG Huirong  MA Yuan  WANG Xiaoyu  Steffen MISCHKE  ZHANG Chengjun 《《地质学报》英文版》2019,93(3):778-779

正Objective Precipitation was the highest in the loess plateau during the Early Holocene 10–8 ka BP even to the period 10–3.0 ka BP in the Kesang cave stalagmite westward Tianshan, Xinjiang, based on large numbers of records from paleoclimatic proxies(An et al., 2000; Zhang et al., 2009; Zhang et al., 2018). However, we discovered at first time that floodplain lake-eolian stratigraphical rhythm complex  相似文献   

Late Cretaceous Foraminiferal Biostratigraphy in Gongza, Tingri, Southern Tibet     

LI Qi  LI Guobiao  LI Xinf  WANG Tieyang  LI Yuewei  ZHANG Wen Yuan  XIE Dan  Li Xingpeng  MA Xuesong  SHI Wei  GUO Baojie 《《地质学报》英文版》2019,93(Z2):259-260

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Sedimentary Environment Recorded by Microfossils from the Strata of the Taozhuang Neolithic Site in Xinghua, Jiangsu Province, China     

WU Li  ZHU Cheng  MA Chunmei  ZHAO Quanhong 《《地质学报》英文版》2019,93(Z2):280-281

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Controlling Factors of Organic Nanopore Development: A Case Study on Marine Shale in the Middle and Upper Yangtze Region,South China     

LIANG Feng  ZHANG Qin  CUI Huiying  MENG Qingqiang  MA Chao  LIANG Pingping  GUO Wei 《《地质学报》英文版》2019,93(4):1047-1059

The Upper Ordovician Wufeng-Lower Silurian Longmaxi and the Lower Cambrian Qiongzhusi shales are the major targets for shale gas exploration and development in China. Although the two organic-rich shales share similar distribution ranges and thicknesses, they exhibit substantially different exploration and development results. This work analyzed the nanopore structures of the shale reservoirs in this region. Pore development of 51 shale samples collected from various formations and locations was compared using the petromineralogical, geochemical, structural geological and reservoir geological methods. The results indicate that the reservoir space in these shales is dominated by organic pores and the total pore volume of micropores, mesopores, macropores in different tectonic areas and formations show different trends with the increase of TOC. It is suggested that organic pores of shale can be well preserved in areas with simple structure and suitable preservation conditions, and the shale with smaller maximum ancient burial depth and later hydrocarbon-generation-end-time is also more conducive to pore preservation. Organic pore evolution models are established, and they are as follows: ① Organic matter pore development stage, ② Early stage of organic matter pore destruction, and ③ late stage of organic matter pore destruction. The areas conducive to pore development are favorable for shale gas development. Research results can effectively guide the optimization and evaluation of favorable areas of shale gas.  相似文献   

Early Evolution of Marine Planktonic and Nektonic Ecosystems:Questions and Chinese Approaches     

ZHANG Yuandong  ZHANG Junpeng  YAN Kui  FANG Xiang  LI Wenjie  MA Xuan  WU Xuejin 《《地质学报》英文版》2019,93(Z1):169-172

正The originations of marine planktons and nektons are significantly delayed than that of benthos,as evidenced by the fossil record.The Cambrian Explosion produced a variety of high-level marine organisms,and many remarkablebody-plans.However,a majority of these organisms are benthic or level-bottomed,and are rather dependent on the substrates of sea floors.This conclusion holds even with the giant predator  相似文献   

The General Situation of Geothermal Resources in Ordos Basin     

DENG Changsheng  ZHANG Yi  XIE Xiaofei  MI Weiwei  MA Qiang  XU Min  SONG Jiaxuan  QIANG Juan 《《地质学报》英文版》2019,93(Z2):164-165

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Estimates of sediment and nutrient loads in 10 major catchments draining to the Great Barrier Reef during 2006-2009     

Joo M  Raymond MA  McNeil VH  Huggins R  Turner RD  Choy S 《Marine pollution bulletin》2012,65(4-9):150-166

The Great Barrier Reef (GBR) catchment area has been monitored simultaneously for sediment and nutrient exports from 10 priority catchments discharging into the GBR lagoon between 2006 and 2009. This allows GBR catchment-wide exports to be estimated and spatially compared within a discrete time-frame. Elevated levels of sediment and nutrient exports were recorded in all monitored catchments as compared to pre-European estimates, but vary around previous estimates of mean annual loads. During the period of monitoring, the Burdekin and Fitzroy catchments contributed the highest sediment and nutrient exports, however when loads were normalised for area, these catchments produced the lowest unit yields. In contrast, the highest yields were produced in the wetter and proportionately more intensively cultivated Johnstone, O'Connell, and Pioneer catchments particularly for dissolved nitrogens. This assessment offers the necessary scientific foundation for future monitoring, assessment, and management of sediment and nutrient loads entering the GBR.  相似文献   

皖南新元古代花岗闪长岩地球化学特征及构造环境     

翁望飞  支利庚  蔡连友  李永成  徐生发  王邦民 《火山地质与矿产》2012,(2):86-95

皖南新元古代花岗闪长岩沿祁门-歙县-三阳深断裂呈串珠状出露。本文在对其岩石学、地球化学细致分析的基础上,探讨了岩体的岩石成因和产出环境。皖南新元古代花岗闪长岩主要由石英、钾长石和斜长石组成,普遍含富铝矿物黑云母和堇青石,副矿物包括锆石、磷灰石、钛铁矿、独居石、磷钇矿、极少的磁铁矿等。地球化学分析数据显示,岩石总体具高硅、高钾、高铝和低钠、低镁、低钙的特征;岩石富碱（ALK=6．63％）,高K2O／Na2O比值（1．33）。里特曼指数δ为0．8～2．91,碱度率AR为1．56～3．14,属高钾钙碱性系列。岩石铝饱和指数（A／CNK-1．31）大于1．1,具强过铝质S型花岗岩的特征。岩石稀土元素呈轻稀土富集、重稀土亏损的特征,∑LREE／∑HREE比值为5．36～8．36,具较强的负铕异常（δEu=0．39～0．7）,配分模式为右倾“V”字形态;微量元素明显富集Rb、Th而亏损Ba、Nb、Ta、Sr等,为低Sr高Yb型花岗岩。地球化学特征显示其岩浆源于围岩-中元古代牛屋组浅变质千枚岩的部分熔融,反映陆-陆碰撞挤压造山环境,为晋宁运动晚期华夏板块向北俯冲与扬子板块碰撞造山的火山弧产物。  相似文献