陕西汉阴县观音河花岗岩脉成因分析
Analysis on the Cause of the Guanyinhe Granodiorite Vein in Hanyin County, Shaanxi Province
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摘要: 通过对陕西汉阴县观音河花岗岩脉的地球化学分析，初步探讨观音河花岗岩脉的地球化学特征和成因。岩脉产出于勉略缝合带以北，位于白水江-白河褶皱束。研究表明，观音河花岗岩脉岩性为花岗闪长岩，具有高硅、富铝、贫铁镁、低碱的特征，属过铝质钙碱性岩。富集Rb、Ba、Th等大离子亲石元素及Sr等不相容元素，亏损K、Ta、Nb等元素，未见Eu异常，稀土元素配分模式呈陡的右倾型。显微镜下可见方解石既形成独立矿物颗粒，又为斜长石蚀变矿物，指示热液作用。成岩类型为I型。构造环境为靠近同碰撞花岗岩（syn-COLG）的火山弧花岗岩（VAG），本区花岗岩脉是勉略构造带晚二叠-中晚三叠世俯冲削减-碰撞造山过程中形成，是岩浆的后期热液产物。Abstract: In this paper, the geochemical characteristics and genesis of Guanyinhe granite vein in Hanyin County, Shaanxi Province have been discussed. The granite veinis located in the north of Mianlue suture,serving as one part of Baishuijiang-Baihe fold beam. Studies have shown that the lithology of this granite vein is granodiorite. It has high Si and Al contents, with low Fe and Mg contents, belongs to peraluminous calc-alkaline rock, which isrich in Rb, Ba, Th and other large ion lithophile elements, as well as Sr and other incompatible elements, with a low content of K, Ta and Nb elements, without Eu anomaly.REE pattern shows steep deviation. Photos under microscope show that calcite mineral has 2 forms, the ones are independent particles, the others are mineral scaused by plagioclase's erosion, indicating hydrothermal activity.Diagenetic type of this granite vein is I-type. Its tectonic environment is the ones of volcanic arc granite (VAG), which is close to the ones of syn-collision granite (syn-COLG), indicating that the granite vein was formed during the plate subduction and collision orogenic process in Late Permian and Mid-Late Triassic, and serving as the products of late magma hydrothermal.
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Key words:
- granitoidveins /
- geochemical characteristics /
- genetic analysis /
- Guanyinhe
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