【摘要】：東昆侖東段香加南山花崗巖基巖漿混合作用明顯,斜長石作為主要造巖礦物,是研究巖石成因、示蹤巖漿演化和巖漿混合過程的有效工具。對香加南山花崗巖基中寄主巖及暗色微粒包體中的斜長石進行巖相學(xué)和礦物化學(xué)研究。電子探針結(jié)果顯示:寄主巖中正常環(huán)帶斜長石(39~48,21~36)、包體中斜長石捕擄晶(41~49,35~36,43~49,31~47,27~38)和寄主巖礦物中包裹斜長石(29~45,14~32)具有演化的An值;部分寄主巖斜長石核部由于受到后期蝕變具有較高的An值(59~72)。包體中基質(zhì)斜長石大部分具核邊結(jié)構(gòu),核部(52,31)和邊部(33~37,25)An值存在間斷;少量斜長石核部受到蝕變,An值較低(49),幔部(55~71)An值高于邊部(46~49);部分包體中基質(zhì)斜長石核部呈補丁狀,暗色部分An值較高(66),淺色部分An值較低(33~39)。包體中斜長石捕擄晶主要分為干凈斜長石捕擄晶和含有礦物的斜長石捕擄晶兩大類,干凈斜長石環(huán)帶明顯或聚片雙晶發(fā)育,An值變化范圍較小(41~49,35~36);含有暗色礦物的斜長石捕擄晶An值整體也呈震蕩變化(43~49,31~47,27~38),但由于受到蝕變,部分測點An值較高(78),少量斜長石具有高An值增生邊(73)。以上研究顯示,結(jié)晶于寄主巖的斜長石正常演化序列反映寄主巖從演化早期到晚期,巖漿逐漸從偏基性向酸性轉(zhuǎn)變;包體基質(zhì)斜長石為包體進入寄主巖溫度、壓力和水飽和度降低導(dǎo)致斜長石受到熔蝕后繼續(xù)結(jié)晶結(jié)果;包體中斜長石捕擄晶來自寄主巖,由于進入包體后溫度和壓力產(chǎn)生變化,以及后期生長,導(dǎo)致斜長石的成分和構(gòu)造有所不同。香加南山花崗巖基及暗色微粒包體中斜長石的復(fù)雜環(huán)帶為幔源鎂鐵質(zhì)巖漿注入長英質(zhì)巖漿混合作用的結(jié)果。
[Abstract]:The magma mixing of Xiangganshan Granitoid in the eastern part of East Kunlun is obvious. Plagioclase, as the main rock-forming mineral, is an effective tool to study the petrogenesis, trace magmatic evolution and magmatic mixing process. The lithofacies and mineral chemistry of plagioclase in the host rocks and dark particle inclusions of the Xiangganshan granite base were studied. The electron microprobe results show that the An values of the plagioclase in the host rock (3948821136), the plagioclase in the inclusions (41O49N35 / 35) and the plagioclase (2945141432) in the host rock minerals are evolutional, and the results of electron microprobe (EPMA) show that the plagioclase in the host rock (2945141432) has evolutionary An values, and the plagioclase in the host rock (2945141432) has the evolutionary An value. The partial host rock plagioclase core has a high An value (5972) due to late alteration. In the matrix plagioclase, most of the matrix plagioclase has a nuclear edge structure with discontinuous An values in the nuclear part (52n31) and the edge part (333725), a small amount of plagioclase core is altered, the An value is lower (49), and the An value of the mantle part (5571) is higher than that of the edge part (460.49), and some of the matrix plagioclase nuclei are patched, and some of the matrix plagioclase nuclei are patched. The An value of the dark part was higher (66), and the An value of the light color part was lower (33 ~ 39). The plagioclase in the inclusion is divided into two types: clean plagioclase and plagioclase containing minerals. The An value of clean plagioclase is obvious or polycrystalline, and the range of An value is small (41 ~ 4935 ~ 36), and the An value of plagioclase with dark minerals is also oscillating (434991n31n47772738), but due to alteration, the An value of plagioclase has been changed. Some of the measured points have higher An value (78), and a few plagioclase have high An proliferative edge (73). The above studies show that the normal evolution sequence of plagioclase crystallized in host rocks reflects the gradual transition of magma from the early to the late stage of host rocks from partial basicity to acidity, and the inclusion matrix plagioclase enters the host rock temperature. The decrease of pressure and water saturation results in the crystallization of plagioclase after corrosion, the pericrystals of plagioclase come from the host rock, and the change of temperature and pressure after entering the inclusion, as well as the later growth of plagioclase. The composition and structure of plagioclase are different. The complex ring belt of plagioclase in Xiangganshan granite base and dark granular inclusion is the result of magmatic mixing of mantle source magnesia-iron magma injected into feldspar magma.
【作者單位】： 長安大學(xué)地球科學(xué)與資源學(xué)院西部礦產(chǎn)資源與地質(zhì)工程教育部重點實驗室國土資源部巖漿作用與找礦重點實驗室;南陽理工學(xué)院土木工程學(xué)院;中國地質(zhì)大學(xué)(北京)
【基金】：國家自然科學(xué)基金項目(編號41472191;41502191;41172186) 中央高�；究蒲袠I(yè)務(wù)費專項資金項目(310827161002;310827161006) 青海省國土資源廳-中國鋁業(yè)公司公益性區(qū)域地質(zhì)礦產(chǎn)調(diào)查基金項目(編號:200801)的成果
【分類號】：P588.121

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