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Seismic event, sequence and tectonic significance in Canglangpu stage in Paleo-Tanlu Fault Zone

Science China Earth Sciences 2002年第9期45卷 781-791页

作者：乔秀夫高林志彭阳李海兵 Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China School of Earth and Space Sciences Peking University Beijing 100871 China

The Canglangpu stage of Lower Cambrian Series is widely distributed along both sides of the Tanlu (Tancheng-Lujiang) Fault Zone in the Jiao-Liao-Xu-Huai regions. In the Liaodong Peninsula, the Canglangpu stage consists of three formations, i.e. Gejiatun, Dalinzi and Jianchang formations in ascending order (lying on the eastern side of the Tanlu Fault Zone). The Dalinzi Formation, developing in a littoral Sabkha environment, is full of catastrophic event records of violent seism, such as liquefied muddy-sandy veins, hydroplastic folds, hydroplastic micro-faults (three forming an organic whole), liquefied crinkled deformations, liquefied breccia and sandy dikes. Based on such records, the seismic liquified sequence of argillaceous rocks in Sabkha is built up. In northern Jiangsu and Anhui provinces, however, there hardly observe seismic records in the Canglangpu stage, which consists of Jinshanzhai and lower Gouhou and upper Gouhou formations (lying on the western side of the Tanlu Fault Zone). Even if the Gouhou Formation, developing in a lagoon-dry environment, is in the same climate zone as the Dalinzi Formation, and 4 depositional sequences have been identified in the Canglangpu stage in Northern Jiangsu and Anhui provinces, however, in the same stage in the Liaodong Peninsula, there exist only 3 ones. Therefore, it is not supported by the above mentioned evidence (such as catastrophic events, sequences stratigraphy and lithologic correlation of formations) that the Canglangpu stage in the Liaodong Peninsula came from northern Jiangsu and Anhui provinces through a long-distance, about hundreds kilometers, left-hand displacement of the Tanlu Fault in the Mesozoic era.

关键词： Canglangpu stage, Dalinzi Formation, Tanlu Fault Zone, catastrophic event of seism, liquefied muddy vein, hydroplastic fold, seismic-liquefied sequence in Sabkha argillaceous rocks.

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Carbon isotope composition and its implications of Lower Cretaceous Aptian-Albian shallow water carbonates in the Cuoqin Basin, North Tibet

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Science China Earth Sciences 2004年第3期47卷 247-254页

作者： ZHU Jingquan1, LI Yongtie2, JIANG Maosheng1 & CHEN Daizhao1 1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 2. Research Institute of Petroleum Exploration and Development, CNPC, Beijing 100083, China Chinese Acad Sci Inst Geol & Geophys Beijing 100029 Peoples R China CNPC Res Inst Petr Explorat & Dev Beijing 100083 Peoples R China

The d 13C values of Lower Cretaceous Aptian-Albian platform-type carbonates in the Cuoqin Basin, North Tibet vary between 2.48 and 5.46. The mean value is 3.93. The values are not only provided with positive excursion, but also 1.17 higher than those of con-temporaneous pelagic carbonates which possess pretty high d 13C values. The origin is ap-proached. During the oceanic anoxic events, a great number of organisms were rapidly buried, causing the increase of the d 13C value of oceanic total dissolved carbon (TDC) and generally promoting the values of marine carbonates. After that, owing to the organisms undergoing dif-ferent isotopic fractionation in the paleo-ocean with stratified structure, d 13C values of shallow sea carbonate were obviously higher than those of pelagic carbonates.

关键词： shallow water carbonate, stable carbon isotope, paleooceanography, Aptian-Albian stage, Cuoqin Basin.

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Discovery and considerations on “Superlarge-Linglong”

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Science China Earth Sciences 2003年第6期46卷 540-546页

作者：刘连登孙振佐陈国华武际春任云生张辉煌 CollegeofEarthSciences JilinUniversity LinglongGoldMine

The primary nugget, first reported in this paper, was discovered in No. 47 branch vein in Dakaitou ore block, Linglong gold deposit, Shandong Province. Thanks to its weight of over 29 kg, exceeding the limit weight (5 kg) of super large nugget, it is named “Superlarge-Linglong” nugget (Superlarge-Linglong). Observed by either naked eye or microscopy, both the Superlarge-Linglong and adjacent scattered-veinlet visible gold are composed of high-purity (903) native gold, exnclud-ing any other minerals. The Superlarge-Linglong does not cut the other types of gold ore bodies made up of high-purity micro electrum. There is, in other ore bodies and siliceous sericitolite, visi-ble gold with similar purity to it and close space-time and genetic relation to it, indicating that it is younger than other ore bodies and siliceous sericitolite. The Superlarge-Linglong and adjacent visible gold are caused by the independent nugget-visible gold metallogenetic stage.

关键词： super large nugget, nugget effect, independent gold metallogenetic stage, Linglong gold deposit in Shandong Province.

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