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Sand veins and MISS from the Mesoproterozoic black shale (ca. 1.7 Ga) in North China:Implication for methane degassing from microbial mats

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Science China Earth Sciences 2008年第11期51卷 1525-1536页

作者： SHI XiaoYing JIANG GanQing zhang chuanheng GAO LinZhi LIU Juan School of Earth Science and Resources China University of GeosciciencesBeijing 100083China State Key Laboratory of Geological Process and Mineral Resources Beijing 100083China Department of Geoscience University of NevadaLas VegasNV 89154-4010USA Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China

The Mesoproterozoic Chuanlinggou Formation (ca. 1.7 Ga) consists mainly of dark-gray to black shales that are widespread in the North China Platform. Abundant centimeter-scale sand veins are present within the shale layers of this unit, particularly in the middle part. Sand veins display ptygmatic shapes, perpendicular or with a high angle to bedding planes. They penetrate the black shale layers but are often terminated by thin, lenticular sandstone beds, forming small-scale ‘tepee-like’ structures. On bedding planes, sand veins are expressed as small ridges with 1–3 mm positive relief. Lack of polygonal shapes and their occurrence in thinly laminated, relatively deep-water shales preclude an origin from sand-filled desiccation cracks. Instead, their close association with microbially induced sedimentary structures (MISS) such as micro-wrinkles and gas blisters, putative bacterial fossils (possibly coccoidal cyanobacteria) and framboidal pyrites, suggests that they were formed by degassing of methane from microbial mat decay. Methane gas disrupted overlying sedimentary layers, creating fractures open to seawater. Fine-grained quartz sands, which were transported into the depositional environment by strong winds, filled the fractures. Sand-filled fractures were shortened and folded during burial compaction, forming ptygmatic shapes. The presence of dispersed dolomite and siderite in these sand veins suggests authigenic carbonate precipitation from anaerobic oxidation of methane (AOM). Sand veins are intensely distributed within the Chuanlinggou Formation and are spatially widespread in the North China Platform. If their methane origin is confirmed, they may have important implications for the Mesoproterozoic paleoclimate. With anoxic oceans and low seawater sulfate concentration during the Mesoproterozoic, methane release from microbial mat decay and/or microbial methanogenesis during shallow burial may have been proportionally higher than that of the modern marine e

关键词： sand veins methane degassing microbial mats Chuanlinggou Formation Mesoproterozoic North China Platform

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The Discovery of the 2.35Ga Crystalline Basement in the Southwest of the Yangtze Block and its Geological Significance

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Acta Geologica Sinica(English Edition) 2018年第6期92卷 2460-2461页

作者： zhang Heng GAO Linzhi zhang chuanheng DING Xiaozhong LI Tingdong LIU Yanxue Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China China University ofGeosciences Beijing 100083China

Objective Archean and Paleoproterozoic rock units crop out in the northern and southwestern portions of the Yangtze Block in the South China Craton. Archean crystalline basement outcrops are restricted to the northern part of the Yangtze Block and are represented by the Kongling *** protoliths of the TTG gneisses at Kongling were emplaced at 3.3–2.7 Ga(Gao et al., 2011). In the southwestern

关键词： Pb SHRIMP Ga

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Earthquake-induced soft-sediment deformation structures in the Mesoproterozoic Wumishan Formation,North China,and their geologic implications

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Science China Earth Sciences 2007年第3期50卷 350-358页

作者： zhang chuanheng WU ZhengJie GAO LinZhi WANG Wei TIAN YanLin MA Chao State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesBeijing 100083China Key Laboratory of Lithospheric Tectonics and Lithoprobing Technology Ministry of EducationChina University of GeosciencesBeijing 100083China School of Geosciences and Resources China University of GeosciencesBeijing 100083China Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China

Soft-sediment structures are key to defining seismites. Two soft-sediment deformation horizons, bounded by undeformed carbonate strata, have been found in the Wumishan Formation in the Jumahe region, 175 km southwest of Beijing. One is in the lowest part of Wumishan Formation; and the other is in the uppermost part of Litho-member I. The soft-sediment structures in these two horizons fall into three categories: mould-and-sag structures, hydraulic shatterings and liquefaction dikes. The mould-and-sag structures are divided into two types: one developed in tidal-flat sediments, accompa-nied by many liquefaction-related structures and characterized by autochthonous post-earthquake sediments in sags, and the other type developed in deep-water environments, is not associated with liquefaction structures, and is overlain immediately by seismogenic tsunamites. The hydraulic shat-terings are composed of pockets of fluidization conglomerate, sand intrusions, and syndepositional faults. The liquefaction dikes fall into two categories: hydraulic-fracturing dikes and lateral-spreading dikes. The former are steep, planar, and pinch out upwards. The latter are snake-like and characterized by no diapir-related drag structures in surrounding rocks. Examination of the attitudes and strati-graphic positions of these structures suggests that these soft-sediment structures are seismogenic, and consequently, are seismites. Most seismites in the Wumishan Formation are developed near the former western, margin fault of Yanliao rift. This occurrence suggests that they could be related to movements on this fault. Other geological implications are discussed.

关键词： Mesoproterozoic Wumishan Formation soft-sediment structures paleo-earthquakes seismites Yanliao rift

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Qingbaikouan and Crygenian in South China:Constraints by SHRIMP Zircon U-Pb dating

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Acta Geologica Sinica(English Edition) 2013年第6期87卷 1540-1553页

作者： GAO Linzhi DING Xiaozhong YIN Chongyu zhang chuanheng Frank R. ETTENSOHN Institute of Geology Chinese Academy of Geological Sciences China University of Sciences Department of Earth and Environment Sciences University of Kentucky

The Qingbaikouan System is the lowest unit of the Neoproterozoic Erathem in Chinese stratigraphic succession,and it now provides a precise geochronological framework and geological time scale for mapping and stratal correlation in ***,a sensitive high-resolution ion microprobe （SHRIMP） U-Pb zircon age date （1368±12 Ma） obtained from a bentonite in the Qingbaikouan Xiamaling Formation indicates that it belongs to the Mesoproterozoic Erathem *** change is a milestone in understanding the Precambrian Stratigraphic Time Scale in China,and it has had great influence on Precambrian correlations in ***,a large amount of geochronological work has been done in the ＂Jiangnan Orogen Belt＂ of South China,and new isotopic data have redefined the traditional recognition of metamorphosed Mesoproterozoic strata from the Sibao orogeny to the Neoproterozoic *** on SHRIMP zircon U-Pb age data,the authors regard the Sibao orogeny （equal to the Wuling orogeny） as a movement at ca 820 Ma,meaning that the Sibao orogeny was not equivalent to the Grenvillian ***,we report here the first SHRIMP U-Pb age of the boundary between the top of the Qingbaikouan Gongdong Formation （786.8±5.6 Ma） and the bottom of the Chang＇an （diamictite） Formation （778.4±5.2 Ma）,which is the age of the lowest diamictite of the Nanhuan System in China.

关键词： Neoproterozoic Nanhuan System SHRIMP U-Pb Geochronology

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Mesoproterozoic age for Xiamaling Formation in North China Plate indicated by zircon SHRIMP dating

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Chinese Science Bulletin 2008年第17期53卷 2665-2671页

作者： GAO LinZhi zhang chuanheng SHI XiaoYing SONG Biao WANG ZiQiang LIU YaoMing Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China China University of Geosciences (Beijing) Beijing 100083 China Beijing SHRIMP Center Beijing 100037 China

Zircon grains of magmatic origin from tuffite layers in the Xiamaling Formation at Zhaojiashan Village, Xuanhua area, Hebei Province, were used for zircon dating with a Sensitive High-Resolution Ion Microprobe (SHRIMP II), which gives a weighted mean 207Pb/206Pb age of 1366±9 Ma. It shows a very similar age (1368±12 Ma) as the zircon dating from the Xiamaling Formation in Western Hill, Beijing. This age proposes that the Xiamaling Formation in the North China plate should be of Mesoproterozoic, instead of Neoproterozoic based on K-Ar, Ar-Ar dating. The new zircon age also indicates the devel- opment of macrofossils algae from the Mesoproterozoic age.

关键词：中元古生代锆石测年中国地质年代

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Revised Chronostratigraphic Framework of the Metamorphic Strata in the Jiangnan Orogenic Belt,South China and its Tectonic Implications

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Acta Geologica Sinica(English Edition) 2012年第2期86卷 339-349页

作者： GAO Linzhi DING Xiaozhong zhang chuanheng CHENJun LIU Yaorong zhang Hang LIU Xanxue PANG Weihua Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China Hunan Institute of Geological Survey Changsha410002HunanChina China University of Sciences Beijing 100083China Chengdu Institute of Mineral and Resource Chengdu 610081SichanChina

In a re-study of regional geology by the China Geological Survey （CGS）, the key problem is in the stratigraphical division and correlation. According to the new isotopic dating of the Mesoand Neoproterozoic in China, there have been great changes in the strata correlation and tectonic explanation. The authors obtained four zircon sensitive high resolution ion micro-probe （SHRIMP） U- Pb datings from the bentonite of the Lengjiaxi Group （822±10 Ma, 823±12 Ma and 834±11 Ma） and Banxi Group （802.6±7.6 Ma） in north Hunan Province, which is considered to be the middle part of the Jiangnan Orogenic Belt. On the basis of the zircon dating mentioned above, the end of the Wuling orogen is first limited in the period from 822 Ma to 802 Ma in one continued outcrop （Lucheng section） in Linxiang city, Hunan Province. Combining a series of new zircon U-Pb datings in the Yangtze and Cathaysia blocks, several Neoproterozoic volcanic events and distribution of the metamorphic rocks in the Jiangnan Orogenic Belt have been distinguished. In the context of the global geodynamics, it is useful to set up a practical and high precision chronological framework and basic and unified late Precambrian section in South China.

关键词： chronostratigraphic tectonic events orogenic belt Meso-and Neoproterozoic South China continent

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Geochronology and Tectonic Evolution of the West Section of the Jiangnan Orogenic Belt

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Acta Geologica Sinica(English Edition) 2015年第5期89卷 1497-1515页

作者： zhang Heng LI Tingdong XIE Ying zhang chuanheng GAO Linzhi GENG Shufang CHEN Tingyu YOU Guoqing Institute of Geology Chinese Academy of Geological Sciences China University of Geosciences Research Institute of Petroleum Exploration and Development Huabei Oilfield Company Petro China

As an important part of South China Old Land, the Jiangnan Orogenic Belt plays a significant role in explaining the assembly and the evolution of the Upper Yangtze Block and Cathaysia, as well as the structure and growth mechanism of continental lithosphere in South *** Lengjiaxi and the Banxi groups are the base strata of the west section of the Jiangnan Orogenic ***, the research of geochronology and tectonic evolution of the Lengjiaxi and the Banxi groups is *** maximum sedimentary age of the Lengjiaxi Group is ca.862 Ma, and the minimum is ca.822 *** zhangjiawan Formation, which is situated in the upper part of the Banxi Group is ca.802 *** Lengjiaxi Group and equivalent strata should thus belong to the Neoproterozoic in *** Jiangnan Orogenic Belt consisting of the Lengjiaxi and the Banxi groups as important constituents is not a Greenville Orogen Belt（1.3 Ga–1.0 Ga）.The Jiangnan Orogenic Belt is a recyclic orogenic belt, and the prototype basin is a foreland basin with materials derived from the southwest and the sediments belong to the active continental *** combining large amounts of dating data of the Lengjiaxi and the Banxi groups as well as equivalent strata, the evolutionary model of the western section of the Jiangnan Orogenic Belt is established as follows： Before 862 Ma, the South China Ocean was subducted beneath the Upper Yangtze Block, while a continental island arc was formed on the side near the Upper Yangtze *** South China Ocean was not closed in this *** 862 Ma to 822 Ma, the Upper Yangtze Block was collided with Cathaysia; and sediments began to be deposited in the foreland basin between the two *** Lengjiaxi Group and equivalent strata were thus formed and the materials might be derived from the recyclic orogenic *** 822 Ma to 802 Ma, Cathaysia continued pushing to the Upper Yangtze Block, experienced the Jinning-Sibao Movement（Wuling Movement）; as result, the folded ba

关键词： zircon U-Pb age evolutionary process Lengjiaxi Group Banxi Group Jinning-Sibao Movement(Wuling Movement) Jiangnan Qrogenic Belt

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Reclassification of the Meso- and Neoproterozoic Chronostratigraphy of North China by SHRIMP Zircon Ages

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Acta Geologica Sinica(English Edition) 2009年第6期83卷 1074-1084页

作者： GAO Linzhi zhang chuanheng LIU Pengju TANG Feng SONG Biao DING Xiaozhong Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China China University ofGeosciences Beijing 100083 China Beijing SHRIMP Center Beijing 100037 China

High-quality zircon U-Pb ages acquired from Meso- and Neoproterozoic strata in North China in recent years has provided a high-resolution chronostratigraphic framework for dating. A basis of this high-level chronostratigraphic system provides the foundation for a global Precambrian study and stratigraphic correlation and so recent geological studies have focused attention on systemic SHRIMP zircon dating. A chronology of Meso- and Neoproterozoic strata and the time of origin of the overlying Changcheng System is given on the basis of new SHRIMP zircon dating from the Qianxi Complex and diabase of the Chuanlinggou Formation. A new tectonostratigraphy for a Neoproterozoic chronostratigraphic framework in the southeastern margin of the North China continent is underpinned by the new SHRIMP zircon dating of a Neoproterozoic mafic magma diabase in the Jiao-Liao-Xu-Huai Sub-Province.

关键词： geochronology SHRIMP U-Pb dating Meso- and Neoproterozoic North China continent

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Detrital Zircon Dating of Meso-and Neoproterozoic Rocks in North China and Its Implications

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Acta Geologica Sinica(English Edition) 2011年第2期85卷 271-282页

作者： GAO Linzhi LIU Pengju YIN Chongyu zhang chuanheng DING Xiaozhong LIU Yanxue SONG Biao Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China China University of Geosciences Beijing 100083 China Beijing SHRIMP Center Beijing 100037 China

New dates from Meso- and Neoproterozoic strata contribute to the recently defined Precambrian stratigraphical timescale of China agreed by the Subcommission on the Precambrian System, and the National Commission on Stratigraphy of China on Nov. 24, 2009. First, the age range of the Changcheng System, including the Changzhougou, Chuanlinggou, Tuanshanzi and Dahongyu formations has been constrained to 1.8-1.6 Ga. Second, the Jixian System including the Gaoyuzhuang,Yangzhuang, Wumishan, Hongshuizhuang and Tieling formations has been constrained to 1.6-1.4 ***, an as-yet unnamed （undefined） system （1.4-1.0 Ga） is only developed in the Xiamaling Formation at the Jixian section, Tianjing. Fourth, the Qingbaikou System, including the Luotuoling and Jing＇eryu formations has been constrained to 1.0-0.78 Ga. Fifth, the Nanhuan System ranges between 780-635 Ma, and the Sinian System is within 635-542 Ma. However, according to a series of SHRIMP U-Pb dates from the late Precambrian in the Jiangnan Orogen Belt in South China Platform, the constrained strata will be redefined as in the upper part of the Qingbaikou System. To aid global geodynamies, it is useful to denote a late Precambrian section with unified, precise and high-precision chronological dating; this is here defined in North China Block and Jiaoliao-Korean Block. However, the Neoproterozoic Qingbaikou study in North China will be influence in whole Meso- and Neoproterozoic in the Jiangnan Orogenic Belt in between the Yangtze Block and the Cathaysia Block in South China.

关键词： Meso- and Neoproterozoic chronostratigraphic sequence tectonic events China

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Sequence Stratigraphy and Relative Sea Level Changes in Sinian System of Yichang, Hubei Province

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Journal of Earth Science 1996年第1期15卷 29-37页

作者： Wang Ziqiang (Department of Geology and Mineral Resources, China University of Geosciences, Beijing 100083) Gao Linzhi (Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037) zhang Linghua Jiang Ganqing zhang chuanheng Yin Yong (Dep

The study on outcrop sequence stratigraphy of the Sinian section in the Yangtze Gorges an important step in the comprehensive stratigraphy for the Sinian stratotype. In this paper, the base of the Nantuo tillite is selected as the bottom boundary of the Sinian, and the top of the Baimatuo Member of the Dengying Formation is taken as the top boundary. The Sinian lasted from 740 the to 570 Ma. According to the features of sequence boundary facies and the parasequence sets, two supersequences are recognized in the Sinian with six sequences. In this paper, the authors discuss the correlation of those sequences. On the basis of the subsidence rate and the thickness of decompressed deposits, the authors discuss the mechanism of tectonic and sedimentation of the Dengying Formation and the features of high-frequency rhythms as well as the 3rd-order sequences in the Yangtze Gorges.

关键词： Sinian System sequence supersequence stacking parasequence set.

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