豫西崤山后河岩体的地球化学及锆石稀土元素特征
发布时间：2018-11-08 16:39
【摘要】：豫西崤山北部内生金属成矿作用较弱,仅有几个规模较小的Au矿床。对崤山北部燕山期酸性小岩体开展岩石成因研究,不仅可对深部动力学过程进行限定,而且为区域找矿思路的转变提供依据。为此,对崤山北部的后河岩体全岩样品进行了主量元素、微量元素、稀土元素及锆石稀土元素成分分析。后河岩体具有高硅、富碱高钾、贫镁低钙的特征,岩体样品投点在SiO_2-K_2O图解中落入钾玄岩系列,A/CNK值介于1.04~1.26之间。后河岩体的稀土配分模式具有右倾平滑、轻稀土富集、重稀土亏损的特征,(La/Yb)_N范围为30.95~49.38,无明显Eu异常。后河岩体富集Rb和Th,具有明显的Nb、Ta、P和Ti负异常,高Sr,低Y、Yb,属于埃达克岩。后河岩体是加厚大陆下地壳的部分熔融形成的,部分熔融源区的残余相矿物包括石榴石和金红石,岩浆演化过程中没有经历明显的斜长石结晶分异作用。后河岩体锆石稀土元素具有轻稀土亏损、重稀土富集、Ce正异常及无明显Eu异常的特征,锆石的形成温度介于624~701℃之间,后河锆石/熔体体系中重稀土元素分配系数变化证明了深部岩浆(流体)混合作用的存在。后河岩体是早白垩世崤山北部岩石圈拆沉作用的产物,这有利于成矿流体和埃达克质岩浆快速上升,其周缘出露申家窑Au矿床及岩体自身明显的Au、Ag、Cu、Mo及W高含量异常均表明后河具有较大的成矿潜力,它应当是崤山北部的找矿靶区之一。
[Abstract]:The mineralization of endogenic metals in the north of Xiaoshan, western Henan Province, is weak, and there are only a few small Au deposits. The petrogenetic study of the Yanshanian acid small rock body in the northern part of Xiaoshan can not only limit the deep dynamic process, but also provide the basis for the transformation of regional ore-prospecting ideas. For this reason, the main elements, trace elements, rare earth elements and zircon rare earth elements in the whole rock samples of the Houhe rock body in the north of Xiaoshan are analyzed. The Houhe rock mass has the characteristics of high silicon, rich alkali and high potassium, and poor magnesium and low calcium. The sample of the rock mass falls into the series of potash rocks in the SiO_2-K_2O diagram, and the A/CNK value is between 1.04 and 1.26. The REE distribution model of the Houhe rock body has the characteristics of smooth right tilt, enrichment of light rare earth elements and depletion of heavy rare earths. The range of (La/Yb) _ N is 30.95U 49.38, and there is no obvious Eu anomaly. The Rb and Th, enriched in the Houhe pluton have obvious negative Nb,Ta,P and Ti anomalies, and the high Sr, and low YYb belong to the adakite. The Houhe rock mass is formed by partial melting of the thickened lower crust of the continent. The residual facies minerals in the partial melting source region include garnet and rutile. There is no obvious crystallization differentiation of plagioclase during magmatic evolution. The rare earth elements of zircon in Houhe rock body are characterized by light rare earth depletion, heavy rare earth enrichment, positive Ce anomaly and no obvious Eu anomaly. The zircon formation temperature is between 624 鈩，
本文编号：2319065
[Abstract]:The mineralization of endogenic metals in the north of Xiaoshan, western Henan Province, is weak, and there are only a few small Au deposits. The petrogenetic study of the Yanshanian acid small rock body in the northern part of Xiaoshan can not only limit the deep dynamic process, but also provide the basis for the transformation of regional ore-prospecting ideas. For this reason, the main elements, trace elements, rare earth elements and zircon rare earth elements in the whole rock samples of the Houhe rock body in the north of Xiaoshan are analyzed. The Houhe rock mass has the characteristics of high silicon, rich alkali and high potassium, and poor magnesium and low calcium. The sample of the rock mass falls into the series of potash rocks in the SiO_2-K_2O diagram, and the A/CNK value is between 1.04 and 1.26. The REE distribution model of the Houhe rock body has the characteristics of smooth right tilt, enrichment of light rare earth elements and depletion of heavy rare earths. The range of (La/Yb) _ N is 30.95U 49.38, and there is no obvious Eu anomaly. The Rb and Th, enriched in the Houhe pluton have obvious negative Nb,Ta,P and Ti anomalies, and the high Sr, and low YYb belong to the adakite. The Houhe rock mass is formed by partial melting of the thickened lower crust of the continent. The residual facies minerals in the partial melting source region include garnet and rutile. There is no obvious crystallization differentiation of plagioclase during magmatic evolution. The rare earth elements of zircon in Houhe rock body are characterized by light rare earth depletion, heavy rare earth enrichment, positive Ce anomaly and no obvious Eu anomaly. The zircon formation temperature is between 624 鈩，
本文编号：2319065
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