發(fā)布時(shí)間：2018-11-08 16:39

【摘要】：豫西崤山北部?jī)?nèi)生金屬成礦作用較弱,僅有幾個(gè)規(guī)模較小的Au礦床。對(duì)崤山北部燕山期酸性小巖體開展巖石成因研究,不僅可對(duì)深部動(dòng)力學(xué)過程進(jìn)行限定,而且為區(qū)域找礦思路的轉(zhuǎn)變提供依據(jù)。為此,對(duì)崤山北部的后河巖體全巖樣品進(jìn)行了主量元素、微量元素、稀土元素及鋯石稀土元素成分分析。后河巖體具有高硅、富堿高鉀、貧鎂低鈣的特征,巖體樣品投點(diǎn)在SiO_2-K_2O圖解中落入鉀玄巖系列,A/CNK值介于1.04~1.26之間。后河巖體的稀土配分模式具有右傾平滑、輕稀土富集、重稀土虧損的特征,(La/Yb)_N范圍為30.95~49.38,無明顯Eu異常。后河巖體富集Rb和Th,具有明顯的Nb、Ta、P和Ti負(fù)異常,高Sr,低Y、Yb,屬于埃達(dá)克巖。后河巖體是加厚大陸下地殼的部分熔融形成的,部分熔融源區(qū)的殘余相礦物包括石榴石和金紅石,巖漿演化過程中沒有經(jīng)歷明顯的斜長石結(jié)晶分異作用。后河巖體鋯石稀土元素具有輕稀土虧損、重稀土富集、Ce正異常及無明顯Eu異常的特征,鋯石的形成溫度介于624~701℃之間,后河鋯石/熔體體系中重稀土元素分配系數(shù)變化證明了深部巖漿(流體)混合作用的存在。后河巖體是早白堊世崤山北部巖石圈拆沉作用的產(chǎn)物,這有利于成礦流體和埃達(dá)克質(zhì)巖漿快速上升,其周緣出露申家窯Au礦床及巖體自身明顯的Au、Ag、Cu、Mo及W高含量異常均表明后河具有較大的成礦潛力,它應(yīng)當(dāng)是崤山北部的找礦靶區(qū)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，

本文編號(hào)：2319065