鄂尔多斯盆地西南缘中生代火成碳酸盐岩的发现及意义

doi:10.11743/ogg20160204

Abstract

Abstract: Ordos basin is a stable cratonic basin in the central-west China.Along the margin of the basin, tectonic activity was intense, thrust-nappe structures were well developed and magmatic events were common.On the contrary, the inner part of the basin was very stable and no magmatic events have been recorded.Lately, we found some igneous carbonate rock dikes intruded into the dolomite of the Jixian System in Qingshen 1 well at the south-western margin of the Ordos basin.These intrusive dykes provide new clues for us to reconsider the tectonic activity inside the basin.In the REE distribution patterns, its characteristics are basically consistent with igneous carbonate rock without significant Eu anomaly.Besides, all data points fall within the range of igneous carbonate rock in the C-O isotope crossplot.According to the zircon U-Pb dating results, the age of the intrusive igneous carbonate rock is 176.2±3.3 Ma.Therefore, the intrusive dykes formed during the regional extension after the subduction between Yangtze Craton and North China Craton, under the control of minor activities of the NE-SW trending basement faults in the Early-Middle Jurassic.These intrusive igneous dykes at the south-western margin of the Ordos basin provide new evidences for us to understand the regional extension background of North China Craton in the Early Jurassic.

Key words: carbon and oxygen isotope, zircon U-Pb dating, igneous carbonate rock, geochemistry, Mesozoic, Ordos Basin

CLC Number:

TE121.3

Xi Shengli, Li Zhenhong, Liu Xinshe. Discovery and significance of the Mesozoic igneous carbonate rock at the southwestern margin of Ordos Basin[J]. Oil & Gas Geology, 2016, 37(2): 173-179.

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Discovery and significance of the Mesozoic igneous carbonate rock at the southwestern margin of Ordos Basin

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