Acta Geologica Sinica

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Phases of Environmental Evolution Indicated by Primary Chemical Elements and Paleontological Records in the Upper Pleistocene‐Holocene Series for the Salawusu River Valley, China
Acta Geologica Sinica - Tập 81 Số 4 - Trang 555-565 - 2007
Baosheng Li, Xiaohao Wen, Qiu Shifan, David Dian Zhang, Shuhuan Du, Chen Deniu, Xianjiao Ou, Dongfeng Niu
Abstract: Studies of lithology, sedimentary facies and the distribution regularity of SiO2 and Al2O3 contents and Al2O3/SiO2 ratio allow us to divide the Upper Pleistocene‐Holocene Series represented by the Milanggouwan section in China's Salawusu River valley into six segments: MGS1, MGS2, MGS3, MGS4, MGS5 and MGS6. The boundary ages for MGS1 (the Dishaogouwan and Dagouwan Formations), MGS2 (the ... hiện toàn bộ
Geochemical Characteristics of C5–C7 Light Hydrocarbons in Gas Hydrates from the Permafrost Region of Qilian Mountains
Acta Geologica Sinica - Tập 90 Số 6 - Trang 2283-2284 - 2016
Min Zhang, Ting Kong, Yu He
Large Tetrapod Burrows from the Permian Naobaogou Formation of the Daqingshan Area, Nei Mongol, China
Acta Geologica Sinica - Tập 87 Số 6 - Trang 1501-1507 - 2013
Jun Liu, Lu Li
AbstractTwo new tetrapod burrow casts from the Naobaogou Formation (Middle or Late Permian) of Nei Mongol, China are described. It marks the first pre‐Cenozoic tetrapod burrow from China, and one of the earliest records of tetrapod burrows. Comparison to other Permian and Triassic burrows suggests that these burrows were created by tetrapod slightly smaller than Lystrosaurus. Deduced from the morp... hiện toàn bộ
Prospects of Carboniferous Shale Gas Exploitation in the Eastern Qaidam Basin
Acta Geologica Sinica - Tập 88 Số 2 - Trang 620-634 - 2014
Yingjie Li, Yanling SUN, Yan Zhao, Chun Chang, Qingchun Yu, Yinsheng Ma
Abstract:Shale gas is a resource of emerging importance in the energy field. Many countries in the world have been making big financial investments in this area. Carboniferous shale in the eastern Qaidam Basin shows good exploration prospects, but limited research and exploration work for shale oil and gas resources has been undertaken. Geochemical analyses were performed on shale derived from the... hiện toàn bộ
Structural Characteristics of the Andaman Forearc Inferred from Interpretation of Multichannel Seismic Reflection Data
Acta Geologica Sinica - Tập 88 Số 4 - Trang 1145-1156 - 2014
Goli Anitha, Dhananjai K. Pandey
AbstractThe Andaman Forearc Basin (AFB) is asymmetric in configuration and filled with a ∼6 km‐thick pile of Neogene to Recent sediments (∼4 s in two‐way travel time: TWT) with distinct zonation. It shows gradual thinning up to ∼3 km (0.8 s in TWT) towards the eastern end with a seabed gradient of 1:30. Thick deformed sediments ∼2 s (TWT) of the Outerarc are associated with intense faulting and oc... hiện toàn bộ
Late Jurassic–Early Cretaceous Plutonism in the Northern Part of the Precambrian North China Craton: SHRIMP Zircon U–Pb Dating of Diorites and Granites from the Yunmengshan Geopark, Beijing
Acta Geologica Sinica - Tập 83 Số 2 - Trang 310-320 - 2009
Yuruo Shi, Xitao Zhao, Yinsheng Ma, Daogong Hu, Qisheng Liu, Zhenhan Wu, Tianming Gao, Dunyi Liu
Abstract:The Yunmengshan Geopark in northern Beijing is located within the Yanshan range. It contains the Yunmengshan batholith, which is dominated by two plutons: the Yunmengshan gneissic granite and the Shicheng gneissic diorite. Four samples of the Yunmengshan gneissic granite give SHRIMP zircon U–Pb ages from 145 to 141 Ma, whereas four samples of the Shicheng gneissic diorite have ages from 1... hiện toàn bộ
New Approaches and Markers for Identifying Secondary Biogenic Coalbed Gas
Acta Geologica Sinica - Tập 86 Số 1 - Trang 199-208 - 2012
Mingxin Tao, Li Jing, Xiaobin Li, Yuzhen Ma, Zhongping Li, Zuodong Wang, Gao Zhongliang, Zhang Xiao-jun, Yanlong Wang
Abstract:According to the adsorption‐desorption characteristics of coalbed gas and analysis of various experimental data, this paper proposes that the generation of secondary biogenic gas (SBG) and its mixing of with the residual thermogenic gas at an early stage inevitably lead to secondary changes of the thermogenic gas and various geochemical additive effects. Experimental results also show tha... hiện toàn bộ
Lower Triassic and Induan‐Olenekian Boundary in Chaohu, Anhui Province, South China
Acta Geologica Sinica - Tập 85 Số 2 - Trang 399-407 - 2011
Jinnan Tong, Laishi Zhao
Abstract:Since the West Pingdingshan Section in Chaohu was proposed as the candidate of the Global Stratotype Section and Point of the Induan‐Olenekian boundary in 2003, the Lower Triassic of Chaohu has been extensively studied. Based on the studies on the Lower Triassic of Chaohu, (1) a continuous conodont zonation is established, which has become an important reference for Lower Triassic stratig... hiện toàn bộ
Petrology and PGE Abundances of High‐Cr and High‐Al Podiform Chromitites and Peridotites from the Bulqiza Ultramafic Massif, Eastern Mirdita Ophiolite, Albania
Acta Geologica Sinica - Tập 92 Số 3 - Trang 1063-1081 - 2018
Tian Qiu, Jingsui Yang, Ibrahim Milushi, Weiwei Wu, Nezir Mekshiqi, Fahui Xiong, Cong Zhang, Tingting Shen
The Bulqiza ultramafic massif, which is part of the eastern Mirdita ophiolite of northern Albania, is world renowned for its high‐Cr chromitite deposits. High‐Cr chromitites hosted in the mantle section are the crystallized products of boninitic melts in a supra‐subduction zone (SSZ). However, economically important high‐Al chromitites are also present in massive dunite of the mantle‐crust transit... hiện toàn bộ
REE Geochemistry in the Weathered Crust of Granites, Longnan Area, Jiangxi Province
Acta Geologica Sinica - Tập 3 Số 2 - Trang 193-209 - 1990
Wu Chengyu, Huang Dianhao, Guo Zhongxun
Abstract Warm and humid climate and gentle hilly topography have provided favourable conditions for the development of the weathering crust of the granite intrusions in the Longnan area, Jiangxi Province. REE is mostly concentrated in an adsorption state in clay in the wholly weathered zone. The rare‐earth minerals enriched in the parent rocks provided the source material for the REE enrichment. E... hiện toàn bộ
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