陕南奥陶系宝塔组灰岩网状裂缝成因

王安东; 周瑶琪; 仲岩磊; 段竟; 王子阳; 张振凯

doi:10.3799/dqkx.2012.093

Volume 37 Issue 4

Jul. 2012

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Article Navigation > Earth Science > 2012 > 37(4): 843-850

WANG An-dong, ZHOU Yao-qi, ZHONG Yan-lei, DUAN Jing, WANG Zi-yang, ZHANG Zhen-kai, 2012. Causes of Reticular Cracks in Ordovician Baota Formation Limestone in Southern Shaanxi. Earth Science, 37(4): 843-850. doi: 10.3799/dqkx.2012.093

Citation:

WANG An-dong, ZHOU Yao-qi, ZHONG Yan-lei, DUAN Jing, WANG Zi-yang, ZHANG Zhen-kai, 2012. Causes of Reticular Cracks in Ordovician Baota Formation Limestone in Southern Shaanxi. Earth Science, 37(4): 843-850. doi: 10.3799/dqkx.2012.093

Citation:

WANG An-dong, ZHOU Yao-qi, ZHONG Yan-lei, DUAN Jing, WANG Zi-yang, ZHANG Zhen-kai, 2012. Causes of Reticular Cracks in Ordovician Baota Formation Limestone in Southern Shaanxi. Earth Science, 37(4): 843-850. doi: 10.3799/dqkx.2012.093

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Causes of Reticular Cracks in Ordovician Baota Formation Limestone in Southern Shaanxi

doi: 10.3799/dqkx.2012.093

1.
School of Geosciences, China University of Petroleum, Qingdao 266555, China
2.
Shengli Oil Production Research Institute of SinoPec, Dongying 257000, China

Received Date: 2012-03-05
Available Online: 2021-10-13
Publish Date: 2012-07-15

Abstract

Abstract

Through Paleontology appraisal, outcrop contrast and under mirror slice observation methods, this paper analyzes the causes of reticular cracks, Baota Formation limestone, Ordovician. Paleontology is mainly of cephalopods (Sinoceras chinensis), trilobites, ostracoda and echinodermata (Metacrinus), occasionally including Brachiopoda, noalga. The formation is divided into two units: the lower purple and the upper celadon. The crack, stretching from the surface and bottom without penetrating the adjacent formation, stops when extended to the biological fossils. The patterns are of nodular, tortoise shell and the S curve, etc; dentate suture lines cut through the crack. Microscopic study shows that shale mass spreads in the limy matrices, with shale mass connected each other or connected to the main crack by the micro crack, the macroaxis of the limy chipping in shale exhibited along the crack. There are no obvious boundaries between limy matrices and shale crack in fresh profile. It is concluded that the Yangtze plate, Baota period was in a stable craton sedimentary environment, and reticular cracks formed due to limy particles by chemical differentiation and clay mineral syneresis in compressions with shale filling cracks with no-flow periods in a deep water(more than euphotic zone) slow deposition low-energy open platform environment, which indicates that cracks formed because of the non-structural causes.
- Baota Formation limestone,
- reticular cracks,
- shale content,
- shrinkage cracks,
- sedimentology,
- tectonics

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References(55)

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Causes of Reticular Cracks in Ordovician Baota Formation Limestone in Southern Shaanxi

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