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2005年10月18日

【期刊论文】Geometry and kinematics of Late Cretaceous inversion structures in the Jiuquan Basin, western China

陈汉林, Buqing Wang a, *, Hanlin Chen a, Shufeng Yang a, Ancheng Xiao a, Xiaogan Cheng a, John A. Rupp b

Cretaceous Research 26 (2005) 319-327,-0001,():

-1年11月30日

摘要

Late Cretaceous inversion structures, which are significant for oil and gas accumulation, are widely distributed throughout the Jiuquan Basin. These structures are primarily made up of inverted faults and fault-related folds. Most of the axial planes of folds are parallel to inverted faults trending north-east, indicating that the principal stress direction was north-westesouth-east in the Late Cretaceous. The average inversion ratios of faults in the four sags that were investigated are 0.39, 0.29, 0.38, 0.32. The average inversion ratio in the Jiuquan Basin is 0.34 and the degree of inversion is moderate to strong. As moderate inversion is suitable for forming excellent hydrocarbon traps, there is considered to be significant potential in the basin for the presence of structural traps.

Jiuquan basin, Late cretaceous, Inversion structure, Geometry, Kinematics, Inversion ratios

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2005年10月18日

【期刊论文】Origin of Cenozoic 'reverse faults' in northeastern China-an example from the Rongxintun fault in the Liaohe basin, China

陈汉林, Hanlin Chen a, b, *, Shufeng Yang a, Jia Chengzao c, Hongbin Sun d, Xiaogan Cheng a

Journal of Asian Earth Sciences 25 (2005) 167-172,-0001,():

-1年11月30日

摘要

In northeastern China, Cenozoic 'reverse faults' can be found in most basins. It was proposed that these faults were the products of inversion tectonics during a Cenozoic regional compressional event. This explanation is inconsistent with regional structures that are dominated by normal faults on seismic profile. As a typical example, the Rongxintun fault in northeastern Liaohe basin is systemically analyzed on the basis of deformation style, sedimentary character, and systemic mapping using seismic data. We conclude that the Rongxintun fault was related to right-lateral strike slipping of the Yannan main fault during the late Paleogene when the Dongying deposition occurred, and it was a secondary right-lateral/reverse fault (P Plane Fault) of the Yannan strike-slip fault system. The fold was a fault related fold formed as a result of movement along the Rongxintun fault. According to this analysis of the Rongxintun fault, we conclude that the Cenozoic 'reverse fault' in northeastern China was a secondary right-lateral/reverse fault of a strike-slip fault system and did not represent a compressional event. This kind of mechanism of 'reverse faulting' is consistent with the fact that there was large-scale strike-slip faulting in northeastern China during the Cenozoic.

Reverse fault, Rongxintun fault, Structural style, Cenozoic, Northeastern China

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2005年10月18日

【期刊论文】CHARACTERISTICS AND EVOLUTION OF MESOZOIC FORELAND FOLD AND THRUST BELTIN WES TERN KUNLUN SHAN, CHINA X

陈汉林, CHEN Han-lin, ZENG Hua-sheng, SHEN Xiao-hua, YANG Shu-feng, ZHANG Guoc-cheng, Xiao Wenjiao, LI Ji-liang and ZHAO Dong-dong

Chinese Science Bulletin Vol. 42 No.7 April 1997 580-584,-0001,():

-1年11月30日

摘要

The authors' analysis of the chemical components and sedimentary characteristics of the well developed Triassic strata in the southeastern part of western Kunlun Shan led them to conclude that the sediments comprise a set of typical deep-water to semi-deep-water flysch that formed in the passive continental margin of the Qiangtang Block. This suit of strata had undergone strong deformation giving rise to a SW-thrusting du-plex, imbricate fans, high-angle thrust fault, recumbent fold, SW-inverted fold, etc.. The deformational intensity weakens gradually southeastward. This is a foreland fold and thrust belt caused by the collision between the Qiangtang Block and the island arc on the southern margin of the the Tarim Plate at the end of late Triassic. The sedimentary and deformational characteristics of the Triassic strata were used to reconstruct the evolution of this foreland fold and thrust belt as proposed below. Before the end of Triassic, this region was a passive continental margin in the north of the Qiangtang Block. The end of Triassic to Jurassic was a stage of thrusting, folding, uplifting and development of the foreland basin. The evolution of the fold and thrust was completed in Cretaceous.

Western Kunlun Shan,, Triassic strata,, sedimentary environment,, deformation,, passive conti-nental margin,, foreland fold and thrust belt

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2005年10月18日

【期刊论文】台西南盆地构造特征与演化

陈汉林, 丁巍伟, 王渝明, 杨树锋, 吴能有

浙江大学学报(理学版),2004,31(2):216~220,-0001,():

-1年11月30日

摘要

通过对南海973航次在该区域的多道地震剖面的解释,并结合重力和磁力资料,发现台西南盆地的主要构造走向为NE-NEE向,沉积上具有独特的双层构造,是一个与南海演化密切相关的新生代伸展型断陷盆地。这个盆地早第三纪开始发育,形成了大量的正断层和由它们控制的一系列半地堑,发育了古新世2渐新世的沉积。渐新世末期盆地受挤压作用影响,发育了一系列的逆冲断层和反转构造,表明了台西南盆地“先张后挤”的演化特征,从中新世开始进入热力学沉降坳陷发育阶段。

南海, 台西南盆地, 双层构造, 反转构造, 构造演化

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2005年10月18日

【期刊论文】南海深海盆磁异常分析及其动力学意义

陈汉林, 丁巍伟, , 杨树锋, 初凤友, 邹乐君, 沈晓华

Journal of Zhejiang University (Science Edition), 2003, 30 (2): 223~229,-0001,():

-1年11月30日

摘要

在南海深海盆分布着大范围规律性很强的条带状磁异常。通过插值切割法对其中东部次海盆和西南次海盆的磁异常进行分析。发现南海深海盆区的磁力异常具有叠加性,西南次海盆主要受约5km以上的浅部磁源的影响,表现为NE2SW向展布,5km以下磁异常的展布开始变得模糊,强度也变弱;而东部次海盆不仅受5km以上的EW向浅部磁源的影响,同时深部磁源也起着很大的作用,在方向上也表现为EW向,但是强度随着深度而减弱。由此提出了两海盆地磁异常差异所反映的地球动力学过程,认为西南次海盆的磁源是通过大陆边缘裂谷作用过程形成;而东部次海盆深部和浅部磁异常的磁源具有同时性和相同形成机理,是通过海底扩张作用的方式形成的。在结合其他研究结果的基础上,探讨了南海西南次海盆和东部次海盆的动力学机制和演化历史。

东部次海盆, 西南次海盆, 插值切割法, 局域场, 区域场, 动力学机制

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