【摘要】：涑水雜巖作為華北克拉通南部早前寒武紀(jì)變質(zhì)基底雜巖的重要組成部分,以中條山地區(qū)出露最好且研究程度最高。在晉陜交界處的韓城和河津地區(qū)也有零星的古老變質(zhì)基底雜巖出露,通常認(rèn)為是中條山地區(qū)涑水雜巖的西延。用LA-ICP-MS鋯石U-Pb方法測(cè)得研究區(qū)內(nèi)的基底巖石角閃斜長(zhǎng)片麻巖、透輝斜長(zhǎng)片麻巖和二長(zhǎng)花崗片麻巖原巖的形成年齡分別為2260±28Ma、2053±34Ma和2098±27Ma,表明晉陜交界處涑水雜巖的形成年齡明顯小于中條山地區(qū)的涑水雜巖,其形成時(shí)代主要應(yīng)為古元古代早期,而非太古宙。鋯石Hf同位素顯示,所分析的鋯石多數(shù)具有低ε_(tái)(Hf)(t)值,最低可達(dá)-6,其二階段模式年齡為2630~2933Ma,表明這些形成于古元古代的巖石為太古宙巖石再循環(huán)的產(chǎn)物,暗示在晉陜交界處可能存在太古宙的古老地殼物質(zhì),同時(shí)也支持華北克拉通南部太古宙地塊劃分的推論。
[Abstract]:Sushui complex is an important part of the early Precambrian metamorphic basement complex in the southern North China Craton. There are also sporadic old metamorphic basement complexes in Hancheng and Hejin areas at the junction of Shanxi and Shaanxi, which are generally considered to be the westward extension of Sushui complex in Zhongtiaoshan area. The hornblende gneiss of the basement rock in the study area was measured by LA-ICP-MS zircon U-Pb method. The age of formation of the granitic gneiss is 2260 鹵28 Ma, 2053 鹵34Ma and 2098 鹵27 Ma, respectively, indicating that the age of the Sushui complex at the junction of Shanxi and Shaanxi is obviously smaller than that of the Sushui complex in Zhongtiaoshan area. The main age of its formation is early Gu Yuan. Not Archean. The Hf isotopes of zircon show that most of the zircon analyzed have low 蔚 _ (Hf) (t) value and the lowest 蔚 _ (Hf) (t) value, with a two-stage model age of 2630 ~ 2933 Ma, indicating that the rocks formed in Gu Yuan ancient times are the products of the recirculation of Archean rocks. It suggests that the Archean ancient crustal material may exist at the junction of Shanxi and Shaanxi, and it also supports the inference of the division of Archean blocks in the southern part of North China Craton.
【作者單位】： 大陸動(dòng)力學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室 西北大學(xué)地質(zhì)學(xué)系;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目《國(guó)家創(chuàng)新研究群體:大陸構(gòu)造與動(dòng)力學(xué)》(批準(zhǔn)號(hào):41421002)、《華北克拉通南緣早前寒武紀(jì)構(gòu)造-熱事件及其地質(zhì)意義》(批準(zhǔn)號(hào):41672188)、《華北克拉通南緣豫陜地區(qū)古元古代構(gòu)造-熱事件研究》(批準(zhǔn)號(hào):41272004)
【分類號(hào)】：P597;P588.3

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