北阿尔金地区米兰红柳沟蛇绿岩的岩石学特征和SHRIMP定年

杨经绥,史仁灯,吴才来,苏德辰,陈松永,王希斌. 北阿尔金地区米兰红柳沟蛇绿岩的岩石学特征和SHRIMP定年[J]. 岩石学报, 2008, 24(7).
引用本文: 杨经绥,史仁灯,吴才来,苏德辰,陈松永,王希斌. 北阿尔金地区米兰红柳沟蛇绿岩的岩石学特征和SHRIMP定年[J]. 岩石学报, 2008, 24(7).
Joseph WOODEN,YANG JingSui,SHI Rendeng,WU Cailai,SU Dechen,CHEN SongYong,WANG Xibin,Joseph WOODEN. Petrology and SHRIMP age of the Hongliugou ophiolite at Milan, north Altun, at the northern margin of the Tibetan plateau[J]. Acta Petrologica Sinica, 2008, 24(7).
Citation: Joseph WOODEN,YANG JingSui,SHI Rendeng,WU Cailai,SU Dechen,CHEN SongYong,WANG Xibin,Joseph WOODEN. Petrology and SHRIMP age of the Hongliugou ophiolite at Milan, north Altun, at the northern margin of the Tibetan plateau[J]. Acta Petrologica Sinica, 2008, 24(7).

北阿尔金地区米兰红柳沟蛇绿岩的岩石学特征和SHRIMP定年

  • 基金项目:

    中国地质调查局资助项目,国家自然科学基金

Petrology and SHRIMP age of the Hongliugou ophiolite at Milan, north Altun, at the northern margin of the Tibetan plateau

  • 米兰红柳沟蛇绿岩是北阿尔金蛇绿岩带中发育和保留最好的蛇绿岩,主要由地幔橄榄岩、镁铁-超镁铁质堆晶杂岩、岩墙群和基性熔岩等组成.它们以规模不等的构造岩块产出,大者长十余km,宽近1km,组成一条近100km长的蛇绿混杂岩带.地幔橄榄岩以方辉橄榄岩为主,有少量纯橄岩,主要由橄榄石(Fo=91.2~92.7),斜方辉石(En=93-98)和少量单斜辉石(En=46)组成;副矿物尖晶石Cr#为43~69(平均55),Mg#为43~64(平均58),表现出深海橄榄岩(Abyssal peridotite)和俯冲带环境(SSZ)橄榄岩成分特点.深成堆晶岩主要由异剥橄榄岩-橄榄二辉石岩-(橄榄)辉石岩-辉长岩-斜长岩,该组合的堆晶岩通常被认为是SSZ构造背景的产物.席状岩墙群的岩石成分与熔岩一致,其TiO2(1%~1.5%)和低含量的K2O<0.3%和P2O5表明具有MORB型的岩石特征,并得到了不相容元素和LREE平坦型和亏损型的球粒陨石标准化模型等证据的支持.该地区另存在一套高Tj的洋岛型拉斑玄武岩.两类熔岩的存在,以及地幔橄榄岩和堆晶岩的不同特征,表明米兰红柳沟蛇绿岩组合可能来自不同构造背景.带中与洋壳俯冲有关的蓝片岩和榴辉岩组成的高压变质带的存在,以及与俯冲碰撞有关的不同类型花岗岩类的产出,表明米兰红柳沟蛇绿混杂岩带代表了一个复杂的板块缝合带.蛇绿岩中辉长岩的锆石SHRIMP年代为479±8Ma,这是获得的第一个北阿尔金蛇绿岩的锆石SHRIMP U-Pb同位素年龄,认为代表蛇绿岩的形成时代.因此,北阿尔金缝合带无论在年龄和特征等方面,均可以与阿尔金断裂带东部的北祁连缝合带对比,证实两个带曾经是一个带,被阿尔金断裂左旋错断了约400km.
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刊出日期:  2008-07-31

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