塔里木盆地巴楚隆起寒武系及奥陶系白云岩类型及形成机理

doi:10.7605/gdlxb.2002.02.003

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Abstract

The Cambrian and Ordovician dolostones in the Bachu uplift area of Tarim Basin are investigated by means of stained thin section microscopic identification, cathodoluminescence (CL) microscopic observation, trace element analysis, carbon and oxygen isotope geochemistry, and fluid inclusion analysis. Four types of dolostones have been differentiated. The first one is composed of micritic dolomites which were formed in supratidal dolomitic flats. The micritic dolomites are characterized by the highest m(Ca)/m(Mg) ratios (averagely 3-10), higher Sr contents (>300×10-6) with a m(Sr)/m(Ba) ratio far higher than 1, higher 13C value (ranging over -1‰—+1‰ PDB) and lower ₁₈O values (ranging between -5‰—-8‰ PDB), with an origin of penecontemporaneous supratidal sabkha dolomitization. The second one consists of fine crystalline dolomites with a cloudy center and bright rim, which were formed in an opening platform shoal setting. These dolomites have a relatively higher m(Ca)/m(Mg) ratio (ranging over 1—2), a relatively higher Sr content (ranging between100-200×10-6) with m(Sr)/m(Ba) ratios higher than 1, minus 13C value (around -2‰) and ₁₈O value are lower(about -7‰). These dolomites were formed by seepage-reflux dolomitization during the penecontemporaneous or early diagenetic stages. The third one is calcareous dolostones with bright and clean dolomite crystals and calcareous fossil remnants. These dolostones were formed in intertidal lime flat and dolomitic flat, as well as open platform shoal environments. The dolomites are characterized by lower m(Ca)/m(Mg)ratios (about 1), lower Sr contents are (about 100×10-6) with m(Sr)/m(Ba) ratios lower than 1, lowest 13C value (between -1‰—-3‰), lower ?18O value (about -6‰). These dolomites were formed by mixing-water dolomitization during the penecontemporaneous or early diagenetic stages. The fourth type is the saccharoidal dolostones with medium to coarse euhedral dolomite crystals. Precursor of this dolostone was formed in open platform shoal environments. The dolomites have lower m(Ca)/m(Mg) ratios (ranging over 1-2), lower Sr contents (< 100×10-6) with lower m(Sr)/m(Ba) ratios (lower than 1), higher 13C values (-1‰—+3‰) and lower ?18O values (-5‰—-8‰). This kind of dolomites resulted from the burial dolomitization during the late diagenetic stages.

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Published: 01 April 2002

About author: Shao Longyi, born in 1964, obtained his Ph.D from China University Mining and Technology (Beijing) in 1989. He is a professor of geology at China University Mining and Technology (Beijing Campus), and mainly working on sedimentology and sequence stratigraphy.

Cite this article:

. THE TYPES AND ORIGIN OF DOLOSTONES OF THE CAMBRIAN AND ORDOVICIAN IN BACHU UPLIFT AREA
OF TARIM BASIN[J]. JOURNAL OF PALAEOGEOGRAPHY, 2002, 4(2): 19-30.

. THE TYPES AND ORIGIN OF DOLOSTONES OF THE CAMBRIAN AND ORDOVICIAN IN BACHU UPLIFT AREA
OF TARIM BASIN[J]. JOPC, 2002, 4(2): 19-30.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2002.02.003 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2002/V4/I2/19

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