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Parametamorphic rocks from Arong County in southeastern Inner Mongolia-Daxinganling district are regarded as Proterozoic in age,belonging to the Wolegen Group and composed of volcanoclastic and sandstone in origin,and have been disputed in tectonic setting.Because of the stability in metamorphism,the rare earth dements indicate the features of their protoliths.The authors integrated the petrologic methods with the geochemical parameters which include ∑REE,∑LREE/∑HREE,δCe,δEu,La/Yb,Sm/Nd,Th/Sc and the standard values of chondrite.The results show that the protoliths of Wolengen Group may be a group of voleanoclastic and continental margin elastic rocks,and their tectonic setting is the continent island arc. 相似文献
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对临沧地体泥盆纪—石炭纪南段组的沉积岩开展碎屑锆石LA-ICP-MS U-Pb定年研究结果表明,所有样品的U-Pb年龄谱存在3个主要峰值:泛非期(530~680Ma)、晚格林威尔期(900~980Ma)和早格林威尔期(1100~1300Ma)。次要峰值年龄为1550~1730Ma和2350~2630Ma,反映了物源区构造-岩浆事件的复杂性。南段组碎屑岩锆石年龄图谱明显区别于思茅地块泥盆纪—石炭纪碎屑锆石年龄图谱,临沧地块南段组碎屑锆石的年龄表明其物源来自东冈瓦纳超大陆,临沧地体应该是来自东冈瓦纳北缘的微地块,这也与其生物特征相吻合。 相似文献
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References： 《东北亚地学研究》2007,10(1):105-109
Parametamorphic rocks from Arong County in southeastern Inner Mongolia- Daxinganling district are regarded as Proterozoic in age, belonging to the Wolegen Group and composed of volcanoclastic and sand- stone in origin, and have been disputed in tectonic setting. Because of the stability in metamorphism, the rare earth elements indicate the features of their protoliths. The authors integrated the petrologic methods with the geochemical parameters which include ЕREE, ЕLREE/NHREE, δCe, δEu, La/Yb, Sm/Nd, Th/Sc and the standard values of chondrite. The results show that the protoliths of Wolengen Group may be a group of volcanoclastic and continental margin clastic rocks, and their tectonic setting is the continent island arc. 相似文献
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东昆仑骆驼沟中-晚奥陶统纳赤台群的变质砂岩地层中发现铜矿点,其野外产出厚度1.90 m,沿走向向西延伸5 m后被新生代地层覆盖,向东被道路覆盖,倾向延伸不定,含孔雀石,手标本样品呈灰白色,薄片状,单个薄片厚0.1~2.0cm不等,孔雀石呈星点状定向分布于片理之间或薄片的一个面成浸染状。样品经显微镜薄片鉴定,定名变质石英砂岩,粒状变晶结构,具定向构造。对该样品的光谱半定量检测分析Cu为1%;X射线衍射检测分析与Cu有关的矿物孔雀石[Cu2(CO3)(OH)2]为1%,绿铜矿[Cu2Cl(OH)3]为1%,含非矿石矿物石英52%,斜长石25%,方解石6%,伊利石4%,白云石9%;化学定量分析Cu为0.99%,TFe为2.48%。结合野外铜矿石产出地质特征和实验测试结果,对该地区大量玄武岩、变玄武岩、变质砂岩、千枚岩、片岩等岩石中铜元素实际测量数据的详细研究表明,成矿元素Cu可能来源于该地区的基性火山岩,富铜的火山岩和砂岩形成后,在区域变质作用过程中其成矿元素从变质火山岩迁移到变质砂岩中,在古生代古老盆地中沉积富集成矿。 相似文献
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