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地质学报  2006 

中国大陆科学钻探主孔榴辉岩中重晶石的发现及其意义

, PP. 1892-1897

Keywords: 中国大陆科学钻探(CCSD),榴辉岩,重晶石,超高压变质

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Abstract:

在中国大陆科学钻探主孔榴辉岩中发现了重晶石。重晶石以包裹体形式保存在石榴子石中,多为浑圆状,表面积平均约250μm2。通过电子探针测试,重晶石中SrO含量大多超过20%,为锶重晶石,其化学分子式为(Ba0.4836~0.6180Sr0.3787~0.4722Ca0.0064~0.0889)S0.9688~0.9963O4。同时还发现榴辉岩中的石榴子石有柯石英假象,温压条件计算表明该榴辉岩的峰期温压条件为696~730℃,2.9~3.2GPa。电子探针成分测定包裹这些重晶石的石榴子石为峰期变质矿物,这进一步说明重晶石也经历过超高压变质。重晶石通常形成于强氧化和高盐度流体作用的条件下,本文的研究表明超高压变质过程中至少出现了一定范围内的强氧化环境和高盐度流体作用,但其地球动力学意义有待进一步研究。

References

[1]  陈意,叶凯,吴春明.2005.榴辉岩常用温压计在应用中应注意的问题.岩石学报,21(4):1067~1080.
[2]  张泽明,许志勤,刘福来,游振东,沈昆,杨经绥,李天福,陈世忠.2004.中国大陆科学钻探工程主孔(100~2050 m)榴辉岩岩石化学研究.岩石学报,20(1):27~42.
[3]  Bertram M A,Cowen J P.1997.Morphological and compositional evidence for biotic precipitation of marine barite.Journal of Marine Research,55(3):577~593.
[4]  Boundy T M,Donohue C L,Essene E J,Mezger K,Austrheim H.2002.Discovery of eclogite facies carbonate rocks from the Linds Nappe,Caledonides,Western Norway.Journal of Metamorphic Geology,20:649~667.
[5]  Deer W A,Howie R A,Zussman J.1997.Rock forming minerals,2nd Edition.London:Geological Society Publishing House.
[6]  Green T H,Hellman P L.1982.Fe-Mg partitioning between coexisting garnet and phengite at high pressure,and comments on a garnet-phengite geothermometer.Lithos,15:253~266.
[7]  Liu F,Xu Z,Liou J,Song B.2004.SHRIMP U-Pb ages of ultrahigh-pressure and retrograde metamorphism of gneisses,south-western Sulu terrane,eastern China.J.Metamorphism Geol.,22:315~326.
[8]  Waters D J,Martin H N.1993.Geobarometry of phengite-bearing eclogites.Terra Abstracts,5:410~41.
[9]  Xiao Y L,Hoefs J,Van Den Kerkhof A M,Fiebig J,Simon J,Fiebig J,Zheng Y F.2002.Fluid evolution during HP and UHP metamorphism in Dabie Shan,China:Constraints from mineral chemistry,fluid inclusions and stable isotopes.Journal of Petrology,43(8):1505~1527.
[10]  刘景波,叶凯,从柏林,范宏瑞.2000.大别山超高压变质带片麻岩锆石中重晶石和硬石膏包裹体及其意义.岩石学报,16(4):482~484.
[11]  张泽明,张金凤,游振东,沈昆.2005.苏鲁造山带超高压变质作用及其P-T-t轨迹.岩石学报,21(2):257~270.
[12]  Bishop J K B.1988.The barite-opal-organic carbon association in oceanic particulate matter.Nature,332(24):341.
[13]  Cong B L,Zhang R Y,Liou J G,Ye K,Wang Q C.1996.Metamorphic evolution of UHPM rocks.In:Cong B L,eds.Ultrahigh-Pressure Metamorphic Rocks in the Dabieshan-Sulu Region of China.Beijing:Science Press,128~160.
[14]  Liou J G,Maruyama S,Zhang R Y,Ogasawara Y.2001.Current advance in the study of ultrahigh-pressure (UHP) metamorphism.UHPM Workshop 2001 at Waseda University,56~60.
[15]  Ravna E K.2000.The garnet-clinopyroxene Fe2+-Mg geothermomter:an updated calibration.Journal of Metamorphic Geology,18:211~219.
[16]  Xiao Y L,Hoefs J,Van Den Kerkhof A M,Fiebig J,Zheng Y F.2000.Fluid history of UHP metamorphism in Dabie Shan,China:a fluid inclusion and oxygen isotope study on the coesite-bearing eclogite from Bixiling.Contributions to Mineralogy and Petrology,139:1~16.

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