本文選題：鋯石U-Pb定年 + 地球化學(xué)�。� 參考：《地質(zhì)科技情報(bào)》2016年05期

【摘要】：東昆侖哈日扎鉛鋅多金屬礦區(qū)地處東昆侖造山帶東段,屬青海都蘭縣境內(nèi),是近年來(lái)新發(fā)現(xiàn)的一處具有良好前景的鉛鋅多金屬礦勘查區(qū)。礦體賦存于英云閃長(zhǎng)巖中,與其具有密切的成礦關(guān)系。利用LA-ICP-MS鋯石U-Pb測(cè)年技術(shù),獲得英云閃長(zhǎng)巖加權(quán)平均年齡為(422.3±1.9)Ma(n=26,MSWD=0.42),確定其形成時(shí)代為晚志留世,屬加里東晚期。這也是該區(qū)首次發(fā)現(xiàn)與成礦密切相關(guān)的加里東晚期巖體。巖石地球化學(xué)研究表明,該英云閃長(zhǎng)巖為強(qiáng)過(guò)鋁質(zhì)高鉀鈣堿性系列巖石;明顯表現(xiàn)為富集Rb、K等大離子親石元素、LREE和活潑的不相容元素(U、Th),相對(duì)虧損Nb、Ta、P、Ti等高場(chǎng)強(qiáng)元素和Sr元素,顯示了輕稀土元素強(qiáng)烈富集的右傾式稀土元素配分型式,具較明顯的負(fù)Eu異常。巖石物質(zhì)來(lái)源具有殼�；烊鄣奶攸c(diǎn)。綜合東昆侖區(qū)域地質(zhì)構(gòu)造演化特征,認(rèn)為哈日扎英云閃長(zhǎng)巖可能形成于后碰撞構(gòu)造階段,為東昆侖造山帶早古生代構(gòu)造旋回的產(chǎn)物。
[Abstract]:The Hareza Pb-Zn polymetallic ore area in East Kunlun is located in the eastern part of the East Kunlun orogenic belt and belongs to Dulan County in Qinghai Province. It is a promising prospecting area for the Pb-Zn polymetallic deposits discovered in recent years. The orebody occurs in Yingyun diorite and has a close metallogenic relationship. Using LA-ICP-MS zircon U-Pb dating technique, the weighted mean age of quartz diorite is 422.3 鹵1.9m ~ (26) MSWD ~ (0.42), which is determined to be late Silurian, belonging to the late Caledonian period. This is the first time that the late Caledonian rock mass closely related to mineralization was discovered in this area. The petrogeochemical study shows that the diorite is a strong peraluminous high potassium calc-alkaline series of rocks, which is obviously characterized by enrichment of large ion lithophile elements, such as RbCon K, LREE, and active incompatible elements, such as UTH, and the relative depletion of high field strength elements and Sr elements, such as NbBU TaPnTi, etc. It is shown that the REE distribution pattern with strong enrichment of light rare earth elements (LREE) is of the right-dip REE distribution pattern with obvious negative EU anomalies. The source of rock material is characterized by mixing of crust and mantle. Based on the characteristics of the regional tectonic evolution in East Kunlun, it is considered that the Haliza diorite may have been formed in the post-collision tectonic stage and was the product of the early Paleozoic tectonic cycle in the East Kunlun orogenic belt.
【作者單位】： 中國(guó)地質(zhì)調(diào)查局西安地質(zhì)調(diào)查中心;長(zhǎng)安大學(xué);青海省第三地質(zhì)礦產(chǎn)勘查院;
【基金】：中國(guó)地質(zhì)調(diào)查局項(xiàng)目(DD20160013) 西北整裝勘查跟蹤綜合與動(dòng)態(tài)評(píng)估(1212011220861) 青海省都蘭縣察汗烏蘇河地區(qū)1∶5萬(wàn)地質(zhì)礦產(chǎn)綜合調(diào)查(12120115022101)
【分類號(hào)】：P597.3;P618.2

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 王德滋;林承毅;周新民;;江西慈竹英云閃長(zhǎng)巖體及其周圍區(qū)域變質(zhì)巖石的成因[J];南京大學(xué)學(xué)報(bào)(自然科學(xué)版);1978年01期

2 王來(lái)明;鄢毅民;;山東棲霞地區(qū)太古宙英云閃長(zhǎng)巖[J];山東地質(zhì);1992年01期

3 柴鳳梅;歐陽(yáng)劉進(jìn);董連慧;楊富全;劉鋒;張志欣;李強(qiáng);;新疆阿舍勒銅鋅礦區(qū)英云閃長(zhǎng)巖年代學(xué)及地球化學(xué)[J];巖石礦物學(xué)雜志;2013年01期

4 A.R卡洛斯 ,王一先;諾瓦斯科夏南部深成巖體的英云閃長(zhǎng)巖和花崗巖類的地球化學(xué)[J];地質(zhì)地球化學(xué);1978年09期

5 K.C.Condie ,馬紹剛;大陸的起源及其早期增長(zhǎng)速率[J];地質(zhì)地球化學(xué);1987年11期

6 裴福萍;王志偉;曹花花;許文良;王楓;;吉林省中部地區(qū)早古生代英云閃長(zhǎng)巖的成因:鋯石U-Pb年代學(xué)和地球化學(xué)證據(jù)[J];巖石學(xué)報(bào);2014年07期

7 何松;;大別山發(fā)現(xiàn)新巖石類型——英云閃長(zhǎng)巖[J];地質(zhì)與勘探;1988年07期

8 孫景貴;林強(qiáng);葛文春;;遼寧金州地區(qū)太古宙英云閃長(zhǎng)巖體的變形與侵位的構(gòu)造環(huán)境[J];吉林地質(zhì);1992年04期

9 Е.М.Лазько;宿懷壁;;花崗綠巖區(qū)內(nèi)的英云閃長(zhǎng)巖層的問(wèn)題[J];地質(zhì)地球化學(xué);1984年07期

10 ;太古宙英云閃長(zhǎng)巖的成因[J];國(guó)外前寒武紀(jì)地質(zhì);1983年01期

相關(guān)會(huì)議論文 前1條

1 夏斌;韋棟梁;王冉;周國(guó)慶;;雅魯藏布縫合帶澤當(dāng)?shù)貐^(qū)英云閃長(zhǎng)巖的成因探討——特提斯洋內(nèi)俯沖的新證據(jù)[A];2006年全國(guó)巖石學(xué)與地球動(dòng)力學(xué)研討會(huì)論文摘要集[C];2006年

，

本文編號(hào)：1804859