【摘要】：南秦嶺石泉北部中酸性巖脈發(fā)育,大部分巖脈與地層之間為構(gòu)造接觸關(guān)系,其形成時代及與區(qū)域金礦化的關(guān)系一直存在疑問。本研究采集石泉北部將軍河地區(qū)中酸性巖脈13件,通過詳細野外觀察與室內(nèi)鑒定,確定巖脈的巖性主要為閃長巖類。主量元素分析數(shù)據(jù)表明閃長巖的SiO_2含量為53.19%~68.48%,鋁飽和指數(shù)A/CNK值為0.67~1.28,里特曼指數(shù)σ值介于1.4~2.93之間;微量元素分析數(shù)據(jù)表明中酸性閃長巖脈的稀土總量較低(ΣREE=44.54×10~(-6)~253.23×10~(-6)),REE球粒隕石標準化圖呈輕、重稀土高度分餾的右傾型(HREE/LREE=6.15~14.87,(La/Yb)_N=5.97~38.67),具有弱負Eu異常(δEu=0.68~0.88);微量元素蛛網(wǎng)圖顯示富集大離子親石元素(Ba、K、Sr)與高場強元素(Zr、Hf),相對虧損高場強元素(HREE、Ti、P、Th),巖脈可能來自于與消減作用有關(guān)的下地殼物質(zhì)重熔。閃長巖脈的單顆粒鋯石U-Pb年齡為771.9±3.4Ma,與漢南雜巖、安康北部的鳳凰山內(nèi)新元古代的巖漿活動具有同步性,指示區(qū)域伸展裂解的構(gòu)造背景。根據(jù)野外填圖推測南秦嶺石泉北部將軍河地區(qū)新元古代的巖脈對金礦的形成沒有直接關(guān)系。
[Abstract]:The middle-acid veins in the north of Shi Quan in the southern Qinling Mountains are developed, and most of the veins are in contact with strata. The formation age of the veins and the relationship between them and regional gold mineralization have always been in doubt. In this study, 13 intermediate-acid veins in Jianguhe area, northern Shi Quan, were collected. Through detailed field observation and laboratory identification, it was determined that the lithology of the veins was mainly diorite. The data of principal element analysis show that the SiO_2 content of diorite is 53.19% 鈮，

本文編號：2491292