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JIN Zhen kui, FENG Zeng zhao. Origin of Dolostones of the Lower Permian in East Yunnan—West Sichuan ——Dolomitization through Leaching of Basalts[J]. Acta Sedimentologica Sinica, 1999, 17(3): 383-389.
Citation: JIN Zhen kui, FENG Zeng zhao. Origin of Dolostones of the Lower Permian in East Yunnan—West Sichuan ——Dolomitization through Leaching of Basalts[J]. Acta Sedimentologica Sinica, 1999, 17(3): 383-389.

Origin of Dolostones of the Lower Permian in East Yunnan—West Sichuan ——Dolomitization through Leaching of Basalts

  • Received Date: 1998-11-23
  • Publish Date: 1999-09-10
  • In the East Yunnan—West Sichuan area,dolostones are well developed and can be divided into two types:massive dolostones and patchy dolostones. Massive dolostones are light gray and gray,and mainly consist of fine or medium dolomites.The δ13C is +0.8‰~+3.5‰(PDB) and averages +2.7‰;δ18O is -6.8‰~-9.1‰(PDB) and averages -7.8‰.Sr is 25×10-6~52×10-6 and averages 39×10-6;Na is 52×10-6~74×10-6 and averages 64×10-6.Patchy dolostones are gray and consist of dolomite patches and calcite patches,with dolomite patches over 50%.The dolomite patches are several centimeters to over 20 cm in size and consist of fine to medium dolomite crystals.The dolomite crystals are euhedral or subhedral and are commonly 60%~90%.The δ13C is +3.1‰~+4.0‰ and averages +3.6‰;δ18O is -6.4‰~-8.1‰ and averages -7.8‰.Sr is 46×10-6~68×10-6 and averages 55×10-6;Na is 60×10-6~89×10-6 and averages 74×10-6. Various data show that massive dolostones and patchy dolostones are the same in origin and different only in dolomitization degree.These dolostones were formed under burial conditions,and the dolomitizing water was fresh meteoric water leaching basalts.The Mg2+ for dolomitization came from weathering and dissolution of basalts.Very thick basalts formed high mountains.which formed great relief of landform and large water head and made the meteoric water leaching basalts flow deep into underground.Such water resulted in large scale dolomitization of limestones.Thus,the dolomitization mechanism in this area may be called "dolomitization through leaching of basalts”.
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  • Received:  1998-11-23
  • Published:  1999-09-10

Origin of Dolostones of the Lower Permian in East Yunnan—West Sichuan ——Dolomitization through Leaching of Basalts

Abstract: In the East Yunnan—West Sichuan area,dolostones are well developed and can be divided into two types:massive dolostones and patchy dolostones. Massive dolostones are light gray and gray,and mainly consist of fine or medium dolomites.The δ13C is +0.8‰~+3.5‰(PDB) and averages +2.7‰;δ18O is -6.8‰~-9.1‰(PDB) and averages -7.8‰.Sr is 25×10-6~52×10-6 and averages 39×10-6;Na is 52×10-6~74×10-6 and averages 64×10-6.Patchy dolostones are gray and consist of dolomite patches and calcite patches,with dolomite patches over 50%.The dolomite patches are several centimeters to over 20 cm in size and consist of fine to medium dolomite crystals.The dolomite crystals are euhedral or subhedral and are commonly 60%~90%.The δ13C is +3.1‰~+4.0‰ and averages +3.6‰;δ18O is -6.4‰~-8.1‰ and averages -7.8‰.Sr is 46×10-6~68×10-6 and averages 55×10-6;Na is 60×10-6~89×10-6 and averages 74×10-6. Various data show that massive dolostones and patchy dolostones are the same in origin and different only in dolomitization degree.These dolostones were formed under burial conditions,and the dolomitizing water was fresh meteoric water leaching basalts.The Mg2+ for dolomitization came from weathering and dissolution of basalts.Very thick basalts formed high mountains.which formed great relief of landform and large water head and made the meteoric water leaching basalts flow deep into underground.Such water resulted in large scale dolomitization of limestones.Thus,the dolomitization mechanism in this area may be called "dolomitization through leaching of basalts”.

JIN Zhen kui, FENG Zeng zhao. Origin of Dolostones of the Lower Permian in East Yunnan—West Sichuan ——Dolomitization through Leaching of Basalts[J]. Acta Sedimentologica Sinica, 1999, 17(3): 383-389.
Citation: JIN Zhen kui, FENG Zeng zhao. Origin of Dolostones of the Lower Permian in East Yunnan—West Sichuan ——Dolomitization through Leaching of Basalts[J]. Acta Sedimentologica Sinica, 1999, 17(3): 383-389.
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