【摘要】：河南欒川脈石英礦床主要分布于河南省熊耳山地區(qū)馬超營斷裂帶中段南側(cè),大地構(gòu)造上處于華北陸塊南緣。本文針對M4、M11、石門寨三個典型脈石英礦床進(jìn)行研究,通過野外調(diào)查和室內(nèi)研究,查明了脈石英礦床的構(gòu)造控礦特征、礦體產(chǎn)狀和規(guī)模、礦物組合、圍巖蝕變等特征,探討了成礦物質(zhì)來源、成礦流體演化、成礦環(huán)境,總結(jié)了礦床成因類型,研究取得如下主要成果:1、M4、M11脈石英礦床賦存于熊耳群許山組斑狀安山巖內(nèi),石門寨脈石英礦床賦存于熊耳群雞蛋坪組流紋斑巖內(nèi),礦體呈脈狀、透鏡狀,嚴(yán)格受斷裂構(gòu)造控制,走向主要為東西向,圍巖蝕變主要為硅化,其他圍巖蝕變不明顯。2、通過流體包裹體研究,顯示成礦溫度主要集中在100~160℃,鹽度主要集中在6%~8%NaCleqv,密度集中在0.90~1.05g/cm3,并根據(jù)均一溫度—鹽度的計(jì)算公式得出其成礦深度為1~2km,平均1.38km,指示其成礦流體屬于淺成低溫、低鹽度、低密度的流體。3、通過H-O同位素研究,顯示成礦流體由巖漿熱液演化而來,并在巖漿驅(qū)動下,運(yùn)移過程中混入了大量的大氣降水,使得流體中大氣降水占據(jù)主要成分。4、通過Si同位素研究,研究區(qū)脈石英礦床中石英和南泥湖、駱駝山金屬礦床中石英和巖體的δ30Si相差不大,為0.1‰~0.5‰,顯示其成因類型相同,且符合熱液成因中石英的Si同位素組成-1.5‰~0.8‰。5、通過微量及稀土元素研究,研究區(qū)脈石英中石英和南泥湖、駱駝山金屬礦床中石英的微量及稀土元素含量和分布特征差異很小,微量元素標(biāo)準(zhǔn)化蛛網(wǎng)圖和稀土元素標(biāo)準(zhǔn)化分布型式圖趨勢基本一致,僅Cu、Mo、W、Ba、Sr元素的含量有差異,顯示出巖漿熱液流體的相似性,且可能是同一巖漿熱液活動的產(chǎn)物。
[Abstract]:The Luanchuan vein quartz deposit in Henan Province is mainly distributed in the south of the Machaoying fault zone in Xiong'ershan area of Henan Province and is located in the southern margin of the North China continental block structurally. In this paper, three typical vein quartz deposits of M4CU M11 and Shimenzhai are studied. Through field investigation and laboratory study, the characteristics of tectonic ore-controlling, occurrence and scale of orebody, mineral assemblage and alteration of surrounding rock are found out. The source of ore-forming material, the evolution of ore-forming fluid and the metallogenic environment are discussed, and the genetic types of the deposit are summarized. The main results are as follows: 1the quartz deposit of vein M4M11 occurs in porphyry andesite of Xushan formation of Xiong er Group. The Shimenzhai vein quartz deposit occurs in the fluid grain porphyry of Qiuping formation in Xiong'er Group. The orebody is vein-like, lenticular and strictly controlled by the fault structure. Its strike is mainly east-west, its surrounding rock alteration is mainly silicified, and the other wall rock alteration is not obvious. Through fluid inclusion study, it is shown that the ore-forming temperature is mainly concentrated at 100 ~ 160 鈩，

本文編號：2297939