本文選題：青海南山 + 黑馬河花崗雜巖體　； 參考：《地質(zhì)論評(píng)》2017年04期

【摘要】：本文對(duì)青海南山構(gòu)造帶西段黑馬河花崗雜巖體中的石英閃長(zhǎng)巖和花崗閃長(zhǎng)巖以及花崗閃長(zhǎng)巖中的暗色微粒包體進(jìn)行了詳細(xì)的巖石學(xué)、巖石地球化學(xué)和LA-ICP-MS鋯石U-Pb年代學(xué)研究。結(jié)果表明,花崗閃長(zhǎng)巖及暗色微粒包體的結(jié)晶年齡分別為244.4±1.1 Ma和243.0±1.2 Ma,表明巖體形成于中三疊世早期。石英閃長(zhǎng)巖和花崗閃長(zhǎng)巖為準(zhǔn)鋁質(zhì)高鉀鈣堿性系列,暗色微粒包體為高鉀鈣堿性—鉀玄巖系列,稀土元素配分曲線均具有輕重稀土明顯分異的右傾特征,具弱負(fù)Eu異常(δEu=0.65~0.83),富集大離子親石元素(Cs、Rb、Th、K)和Pb,虧損高場(chǎng)強(qiáng)元素(Nb、Ta、Ti)和P、Ba負(fù)異常。巖相學(xué)和巖石地球化學(xué)特征指示黑馬河花崗雜巖體具殼幔巖漿混合特征,形成于活動(dòng)大陸邊緣的俯沖環(huán)境,石英閃長(zhǎng)巖為受俯沖流體交代的地幔楔部分熔融產(chǎn)生的基性巖漿演化的產(chǎn)物,花崗閃長(zhǎng)巖則源自殼源巖漿與少量幔源巖漿的混合。黑馬河花崗雜巖體是中三疊世早期宗務(wù)隆洋向南俯沖消減的巖漿記錄。
[Abstract]:In this paper, the detailed petrology, geochemistry and LA-ICP-MS zircon U-Pb chronology of quartz diorite and granodiorite in the Haimahe granitic complex in the western part of the Nanshan tectonic belt, Qinghai Province, as well as the dark color particle inclusions in the granodiorite are studied in detail. The results show that the crystallization ages of granodiorite and dark particle inclusions are 244.4 鹵1.1 Ma and 243.0 鹵1.2 Ma, respectively, indicating that the granodiorite was formed in the early Middle Triassic. Quartz diorite and granodiorite are quasi-aluminous high-potassium calc-alkaline series, dark particle inclusions belong to high-potassium calc-alkaline potash series, and the REE distribution curves have the characteristics of right deviation of light and heavy rare earth elements. There are weak negative EU anomalies (未 EU ~ (0.65) ~ (0.65) ~ (0.83), enrichment of large ion lipophilic elements (CsN, Rb ~ (+) and Pb, and depletion of high field strength elements, such as NB ~ (2 +) ~ (2 +) ~ (2 +) and Ba. The petrographic and petrogeochemical characteristics indicate that the Haimahe granitic complex is characterized by the mixing of crust and mantle magma, and formed in the subduction environment of the active continental margin. Quartz diorite is the product of basic magma evolution caused by partial melting of mantle wedge metasomatized by subduction fluid, while granodiorite is derived from the mixing of crust-derived magma and a small amount of mantle-derived magma. The Heimahe granitic complex is a magmatic record of subduction of the Zongwu uplift ocean in the early Middle Triassic.
【作者單位】： 西部礦產(chǎn)資源與地質(zhì)工程教育部重點(diǎn)實(shí)驗(yàn)室 國(guó)土資源部巖漿作用成礦與找礦重點(diǎn)實(shí)驗(yàn)室 長(zhǎng)安大學(xué)地球科學(xué)與資源學(xué)院;山東理工大學(xué)資源與環(huán)境工程學(xué)院;中國(guó)地質(zhì)大學(xué)(
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(編號(hào):41472191、41502191、41172186) 中國(guó)地質(zhì)調(diào)查局地質(zhì)調(diào)查項(xiàng)目(編號(hào):12120114041201、12120114018219) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金項(xiàng)目(編號(hào):CHD2011TD020、2013G1271091、2013G1271092)的成果~~
【分類號(hào)】：P587;P597.3

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