陕西地质
陝西地質
협서지질
GEOLOGY OF SHAANXI
2011年
2期
33-40
,共8页
铝土矿%地质特征%成矿规律%控矿条件%陕西省
鋁土礦%地質特徵%成礦規律%控礦條件%陝西省
려토광%지질특정%성광규률%공광조건%합서성
bauxite%geological feature%metallogenesis%ore-controlled condition%Shaanxi province
陕西省已知铝土矿产地主要分布于陕北的府谷县、渭北的铜川-韩城一带和陕南的西乡、镇巴、南郑地区；已知铝土矿都位于沉积间断面上，受地层层位控制，属滨海-浅海相沉积矿床。陕北和渭北铝土矿主要产于石炭系下统下部本溪组，陕南铝土矿主要产于二叠系上统吴家坪组底部王坡页岩段。成矿的地质构造条件是隆起区边缘。成矿物质来源既有基底碳酸盐岩的溶蚀分解物，也有陆源铝硅酸盐岩的风化分解物。气候条件是有利于使岩石中铝质析出的温暖潮湿条件。时间上有一个较长时间的沉积问断。对成矿有利的地形条件是古地形总体比较平缓，有利于铝硅酸盐风化物在缓慢的搬运过程中充分分解析出Al2O3。
陝西省已知鋁土礦產地主要分佈于陝北的府穀縣、渭北的銅川-韓城一帶和陝南的西鄉、鎮巴、南鄭地區；已知鋁土礦都位于沉積間斷麵上，受地層層位控製，屬濱海-淺海相沉積礦床。陝北和渭北鋁土礦主要產于石炭繫下統下部本溪組，陝南鋁土礦主要產于二疊繫上統吳傢坪組底部王坡頁巖段。成礦的地質構造條件是隆起區邊緣。成礦物質來源既有基底碳痠鹽巖的溶蝕分解物，也有陸源鋁硅痠鹽巖的風化分解物。氣候條件是有利于使巖石中鋁質析齣的溫暖潮濕條件。時間上有一箇較長時間的沉積問斷。對成礦有利的地形條件是古地形總體比較平緩，有利于鋁硅痠鹽風化物在緩慢的搬運過程中充分分解析齣Al2O3。
합서성이지려토광산지주요분포우협북적부곡현、위북적동천-한성일대화협남적서향、진파、남정지구；이지려토광도위우침적간단면상，수지층층위공제，속빈해-천해상침적광상。협북화위북려토광주요산우석탄계하통하부본계조，협남려토광주요산우이첩계상통오가평조저부왕파혈암단。성광적지질구조조건시륭기구변연。성광물질래원기유기저탄산염암적용식분해물，야유륙원려규산염암적풍화분해물。기후조건시유리우사암석중려질석출적온난조습조건。시간상유일개교장시간적침적문단。대성광유리적지형조건시고지형총체비교평완，유리우려규산염풍화물재완만적반운과정중충분분해석출Al2O3。
Bauxite resources in Shaanxi province are mainly distributed in Fugu County, northern Shaanxi Province, the districts of Tongchuan-Hancheng in the northern Weihe River, the area of Xixiang, Zhenba and Nanzheng counties in southern Shaanxi province. Bauxite mineralization occurs on the surface of sedimentary intervals, controlled by stratigraphic horizons and belonging to sedimentary deposit of littoral-neritic facies. Bauxite minerals in northern Shaanxi and the north of the Weihe River occur mainly in the Lower Carboniferous Benxi Formation and in southern Shannxi, bauxite mineralization exists mainly in Wangpo shale portion at the bottom Wujiaping Formation of the upper Permian system. The metallo- genic structures are in the margin of uplift and material source of minerals is of dissolution decomposition products from basement carbonate rocks and also from weathered and decomposed materials of terrigenous aluminum-silicate rocks. Warm and humid climate, long-term sedimentary intervals and some gentle paleotopographic landform in this area were favorable for mineralization.
