中国东部及西秦岭地区新生代岩石圈地幔中的相转变带及其温压条件

苏本勋 张宏福 王巧云 孙赫 肖燕 英基丰. 中国东部及西秦岭地区新生代岩石圈地幔中的相转变带及其温压条件[J]. 岩石学报, 2007, 23(6): 1313-1320.
引用本文: 苏本勋 张宏福 王巧云 孙赫 肖燕 英基丰. 中国东部及西秦岭地区新生代岩石圈地幔中的相转变带及其温压条件[J]. 岩石学报, 2007, 23(6): 1313-1320.
SU BenXun, ZHANG HongFu , WANG QiaoYun , SUN He , XIAO Yan and YING JiFeng. Spinel-garnet phase transition zone of Cenozoic lithospheric mantle beneath the eastern China and western Qinling and its T-P condition[J]. Acta Petrologica Sinica, 2007, 23(6): 1313-1320.
Citation: SU BenXun, ZHANG HongFu , WANG QiaoYun , SUN He , XIAO Yan and YING JiFeng. Spinel-garnet phase transition zone of Cenozoic lithospheric mantle beneath the eastern China and western Qinling and its T-P condition[J]. Acta Petrologica Sinica, 2007, 23(6): 1313-1320.

中国东部及西秦岭地区新生代岩石圈地幔中的相转变带及其温压条件

  • 基金项目:

    中国科学院知识创新工程重要方向项目(批准号:KZCX2-YW-103)和国家自然科学基金委大陆动力学重点项目(批准号:40534022)资助成果.致谢 感谢中国国家地震局地质研究所樊祺诚研究员在成文过程中给予的指导和中国科学院地质与地球物理研究所岩石圈演化国家重点实验室管辖的电子探针实验室毛骞和马玉光在电子探针分析过程中给予的帮助.同时感谢专辑统一编辑徐夕生教授和两位评审人对本文提出的建设性建议.

Spinel-garnet phase transition zone of Cenozoic lithospheric mantle beneath the eastern China and western Qinling and its T-P condition

  • 五相(橄榄石+斜方辉石+单斜辉石+石榴石+尖晶石)共存的地幔橄榄岩捕虏体是来自岩石圈地幔相转变带的直接样品.中国东部及西秦岭地区晚第三至第四纪碱性火山岩携带的少量五相共存的地幔橄榄岩捕虏体为探讨这些地区新生代岩石圈地幔中相转变带提供了宝贵的样品.本文根据地幔橄榄岩捕虏体中石榴石和尖晶石的产出状况,将这些橄榄岩捕虏体分为三类:第一类橄榄岩中尖晶石为粒状残核,尖晶石外缘被石榴石的反应边包围.这种橄榄岩捕虏体代表尖晶石-石榴石相转变带的上限,故称为尖晶石带橄榄岩;第二类橄榄岩中尖晶石和石榴石以单颗粒零散分布为特征,二者共存但未见明显的相转变关系.这类橄榄岩多位于相转变带中部,拟称为尖晶石-石榴石过渡带橄榄岩;第三类橄榄岩中以石榴石为主,尖晶石和辉石等微晶构成石榴石反应边.这类橄榄岩代表尖晶石-石榴石相转变带的下限,故称为石榴石带橄榄岩.因此,根据不同类型橄榄岩捕虏体中矿物的组成,结合温度压力估算即可确定岩石圈地幔中相转变带的深度和厚度.本文通过对中国东部及西秦岭地区晚第三至第四纪碱性火山岩携带的尖晶石-石榴石二辉橄榄岩捕虏体的温度压力估算来进一步厘定中国东部新生代岩石圈地幔中的相转变带深度和厚度.
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修回日期:  2007-02-10
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