本文關(guān)鍵詞： 滇西 騰沖地塊 保山地塊 花崗巖類 巖石學(xué) 地球化學(xué)　出處：《中國地質(zhì)大學(xué)(北京)》2016年博士論文　論文類型：學(xué)位論文

【摘要】：騰沖、保山地塊是滇西特提斯構(gòu)造帶的重要組成部分,保山地塊早古生代巖漿侵位活動主要集中在447~452 Ma和480~490 Ma兩期,中-新生代花崗巖類侵位年齡為83~85Ma和60~66 Ma;騰沖地塊中-新生代花崗巖類侵位年齡為115~118Ma、67~74 Ma和51~55 Ma。保山地塊的巖石類型主要為二長花崗巖和正長花崗巖,富硅,K2O/Na2O比值均大于1,Al2O3含量較高,鋁飽和指數(shù)A/CNK均大于1.1,標(biāo)準(zhǔn)礦物計算結(jié)果中均含有剛玉分子且含量都大于1%,為高鉀鈣堿性過鋁質(zhì)花崗巖;騰沖地塊的巖石類型主要為花崗閃長巖、二長花崗巖和花崗巖,全堿含量高,絕大多數(shù)屬于高鉀鈣堿性和鉀玄巖系列,部分表現(xiàn)高分異鈣堿性特征。保山地塊的巖石總體上都富集Rb、K等大離子親石元素和Pb,相對虧損高場強(qiáng)元素。平河巖基和赧灑巖株,具有明顯的輕稀土富集,重稀土虧損的特征,球粒隕石標(biāo)準(zhǔn)化配分曲線顯示明顯的負(fù)Eu異常,而松坡、平達(dá)、勐堆三個淡色花崗巖株的稀土元素總量都比較低,(La/Yb)N比值較低,稀土元素分配曲線呈“雁式”平緩樣式,體現(xiàn)A型花崗巖的特征。中-新生代巖體輕/重稀土分餾強(qiáng)烈,但巖漿結(jié)晶分異作用不同,兩者與S型花崗巖接近。騰沖地塊中-新生代巖石大部分具明顯的輕/重稀土分餾,部分具“雁式”A型花崗巖特征,可能與巖石本身分異程度較高有關(guān)。保山地塊鋯石Hf同位素組成比較均一,εHf(t)均為負(fù)值,范圍集中在-2.1~-12.4,對應(yīng)的地殼模式年齡集中在1.6~2.2 Ga,推斷其為古老地殼部分熔融的產(chǎn)物。騰沖地塊不同時代巖石的εHf(t)變化范圍較大,變化范圍在-13.1~8.8之間,對應(yīng)的地幔/地殼模式年齡變化范圍在0.41~1.76 Ga之間,推斷其來源于中上地殼并伴隨有不同程度幔源物質(zhì)的加入。由于與拉薩地體在時代、地球化學(xué)性質(zhì)和構(gòu)造記錄方面的可對比性,騰沖、保山地塊很可能與拉薩地體一樣裂離自澳大利亞邊緣,可能與古地理上位于澳大利亞北緣一側(cè)的拉薩地體和古地理上位于印度大陸北緣一側(cè)的特提斯喜馬拉雅、安多、南羌塘一樣,可能代表了面向原特提斯洋一側(cè)的早古生代巖漿弧的一部分。
[Abstract]:The Tengchong and Baoshan massifs are an important part of the Tethys tectonic belt in western Yunnan. The early Paleozoic magmatic emplacement activities of the Baoshan massif are mainly concentrated in the two periods of 447 ~ 452 Ma and 480 ~ 490 Ma. The Mesozoic and Cenozoic granitic emplacement ages are 83 ~ 85 Ma and 60 ~ 66 Ma, respectively, while the Meso-Cenozoic granitic emplacement ages of the Tengchong block are 115 ~ (118) Ma ~ 67 ~ 74 Ma and 51 ~ 55 Ma. The rock types of Baoshan block are mainly monzogranite and syenite. The ratio of K _ 2O _ 2O to Na _ 2O _ 2O is higher than 1% Al _ 2O _ 3, and the Al saturation index A / C _ (K) is higher than 1.1. The standard mineral calculation results all contain corundum molecules and the contents are more than 1%, which are high potassium calc-alkaline peraluminous granites. The rock types of the Tengchong block are mainly granodiorite, monzogranite and granite, and the total alkali content is high, most of them belong to the high-potassium calc-alkaline and potash series. The rocks of Baoshan massif are generally enriched in RbGK and Pb, and are relatively depleted of high field strength elements. The Pinghe rock base and blushing rock plant have obvious characteristics of light rare earth enrichment and heavy rare earth depletion. The normalized distribution curve of chondrites showed obvious negative EU anomalies, while the total amount of rare earth elements in Songpo, Pingda and Mengdui pale granite strains were all relatively low, and the ratio of La- / Yb-N was lower, and the REE distribution curve showed a "geese" flat pattern. The characteristics of A-type granites are reflected. The light / heavy rare earth fractionation of Meso-Cenozoic rocks is strong, but the crystallization differentiation of magma is different, which is close to that of S-type granite. Most of the Meso-Cenozoic rocks in the Tengchong block have obvious light / heavy rare earth fractionation. Some of them are characterized by "Yan" A-type granite, which may be related to the higher degree of differentiation of the rocks themselves. The zircon HF isotopic composition of Baoshan block is relatively uniform, and 蔚 Hftis is negative. The range is -2.1 ~ 12.4, and the corresponding crustal model age is 1.6 ~ 2.2 Ga, which is inferred to be the product of partial melting of the ancient crust. The variation range of the rocks of the Tengchong block in different ages is larger, ranging from -13.1 to 8.8. The corresponding mantle / crustal model ages range from 0.41 to 1.76 Ga. It is inferred that the mantle / crust model originated from the upper and middle crust and was accompanied by the addition of mantle material to different degrees. In terms of geochemical properties and tectonic records, the Tengchong and Baoshan massif are likely to be split from the Australian margin just like the Lhasa terrane. Probably the same as the Lhasa terrane on the northern edge of Australia and the Tethys Himalayas, Ando and southern Qiangtang on the northern edge of the Indian continent. It may represent part of the early Paleozoic magmatic arc facing the side of the original Tethys Ocean.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：P588.1;P542

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