鄂尔多斯盆地奥陶系马家沟组豹皮灰岩特征及其成因

doi:10.7605/gdlxb.2016.01.003

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Abstract

Based on the outcrops observation and survey, thin sections identification,geochemistry analysis and temperature measuring of fluid inclusions,we studied the lithofacies,geochemical characteristics and structural feature of the leopard limestone from the Members 4 and 6 of Ordovician Majiagou Formation(M4 & M6 intervals)in Ordos Basin. In the Jinsushan section of southern Ordos Basin,three parasequence sets are divided by the eustasy in the M6_B interval. The two parasequence sets in the lower part are mainly composed of leopard limestone,in which the continuity and ordering degree of the dolomite mottle are enhanced in ascending order. The dolomite mottle is comprised of euhedral to semihedral dolomites, with the relatively high value of δ¹³C, relatively low value of δ¹⁸C and ⁸⁷Sr/Sr⁸⁶, lower concentration of Fe and Mn, and higher salinity ratio and inclusion homogenization temperature. The results show that the leopard limestone of M4 & M6 intervals was mainly formed at the burial stage during which with the increasing buried depth and formation temperature, the dolomitization occurred by the evaprative seawater in the boriny pore refluxed at low sea-level period.

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	Articles by authors
	Wang Qicong
	Yan Zuo
	Ning Bo
	Shi Kun
	Liu Jiawei
	Li Baiqiang
	Jin Chengguang

Key words： School of Earth Science and Engineering Xi&#x02019 an Shiyou University Xi&#x02019 an 710065 Shaanxi

Received: 09 March 2015 Published: 01 February 2016

ZTFLH:

P588.2

Fund:

Financially supported by the National Science and Technology Major Project(No.2011ZX05005-004-008HZ)

Cite this article:

Wang Qicong,Yan Zuo,Ning Bo et al. Characteristics and genesis of leopard limestone of the Ordovician Majiagou Formation in Ordos Basin[J]. JOPC, 2016, 18(1): 39-48.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2016.01.003 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2016/V18/I1/39

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