Microfacies and Diagenesis Analysis of Bioclastic Limestones of T74Sequence Boundary in Bachu Area, Tarim Basin

Abstract

Abstract:

The T₇⁴ boundary outcrop profile is located in the north-east Bachu County, Tarim Basin, which separate Upper Ordovician and MiddleLower Ordovician. The lithology of this boundary is bioclasts packstones and wackstones. Based on the microfacies analysis, the bioclasts rich in biospecies mainly consist of echinoids especially in crinoids and ostrocods. Other bioclasts include brachiopod, mollusc, trilobite, calcispher, dasycladus, serpulid, foraminifera, sponges and bryozoan. Analysed by microscopes, carbone-oxygen isotope and X-ray fluorescent analysis and so on, the results show that the strata of T₇⁴boundary formed in the warm and lower energy shelf facies and subsequently experienced burial compact diagensis, meteoric diagensis and weathering diagensis following the strata uplifting. The development of stylolite with good porosity and permeability is favour of fluids movement in the subsurface and is an important factor to the development of karst in Middle-Lower Ordovician.

Key words: microfacies analysis, diagenesis, Ordovician carbonate, bioclastic limestone, T₇⁴sequence boundary, Tarim basin, Bachu area

CLC Number:

P534.51
Q913

CHU An-Shen, HUANG Wen-Hui, XU Bing-Song, FAN Ta-Liang. Microfacies and Diagenesis Analysis of Bioclastic Limestones of T₇⁴Sequence Boundary in Bachu Area, Tarim Basin[J]. Geoscience, 2010, 24(2): 294-300.

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Microfacies and Diagenesis Analysis of Bioclastic Limestones of T₇⁴Sequence Boundary in Bachu Area, Tarim Basin

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