河南省荥巩煤田大峪沟矿段深部铝土矿床地质特征及找矿方向
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摘要
荥巩煤田大峪沟矿段深部铝土矿床是最近找矿突破发现的一个大型铝土矿床。该铝土矿床成矿时代为早二叠世,成矿物源主要为古陆铝硅酸岩风化物,少量为中奥陶统马家沟组碳酸盐岩风化产物,成矿环境为潮坪-沼泽环境,由长期的沉积间断、特定的岩相古地理环境、构造变形和表生风化作用共同控制着矿床的形成;上石炭统本溪组是铝土矿形成的含矿岩系;海湾泻湖相沉积环境是铝土矿床形成的有利条件;下古生界奥陶系、寒武系古岩溶侵蚀面是铝土矿形成的有利场所,古岩溶侵蚀面洼地及漏斗是铝土矿的定位空间。大峪沟矿段铝土矿床成因模式属于"古陆风化+碎屑和化学沉积";成矿机制为机械和化学分异。含矿岩系底部铁质风化壳/铁质黏土岩为碳酸盐岩风化形成,铝(黏)土矿来源于铝硅酸盐岩。大峪沟深部铝土矿床的发现为河南省寻找深部铝土矿床指明了方向。
The bauxite deposit to depth of Dayugou domain in Xinggong coalfield is a large deposit discovered recently and a prospecting breakthrough in the area.It is formed at Early Permian Epoch.The ore materials are mainly derived from the weathered ancient continental silicate rocks,a little from weathered carbonate rock of Middle Ordovician Majiagou formation.The bauxite ore is formed under tidal flatswamp environment and the depoposit is controlled by long term deposition break,special lithofacies paleogeography environment,tectonic deformation and supergene weathering.Upper Carboniferous Benxi formationr is the bauxite ore-bearing rock series;the bay lagoon sedimentary environment the favorable condition;Lower Paleozoic Ordovician and Cambrian paleo-karst erosion surface favorable site and depression and funnel at the ancient karst erosion surface the location of bauxite ore.The model of Dayugou bauxite deposits is ancient continental weathering + clastic and chemical deposition.The main metallogenic mechanism is mechanical and chemical differentiation.The iron-bearing weathering crust/iron-bearing clay rock at the bottom of the ore-bearing rock series is formed by weathering of carbonate rocks,and the bauxite-clay ore is derived from aluminosilicate.Discovery of the deep Dayugou bauxite deposit will be aguide for bauxite ore prospecting in Henan province.
The bauxite deposit to depth of Dayugou domain in Xinggong coalfield is a large deposit discovered recently and a prospecting breakthrough in the area.It is formed at Early Permian Epoch.The ore materials are mainly derived from the weathered ancient continental silicate rocks,a little from weathered carbonate rock of Middle Ordovician Majiagou formation.The bauxite ore is formed under tidal flatswamp environment and the depoposit is controlled by long term deposition break,special lithofacies paleogeography environment,tectonic deformation and supergene weathering.Upper Carboniferous Benxi formationr is the bauxite ore-bearing rock series;the bay lagoon sedimentary environment the favorable condition;Lower Paleozoic Ordovician and Cambrian paleo-karst erosion surface favorable site and depression and funnel at the ancient karst erosion surface the location of bauxite ore.The model of Dayugou bauxite deposits is ancient continental weathering + clastic and chemical deposition.The main metallogenic mechanism is mechanical and chemical differentiation.The iron-bearing weathering crust/iron-bearing clay rock at the bottom of the ore-bearing rock series is formed by weathering of carbonate rocks,and the bauxite-clay ore is derived from aluminosilicate.Discovery of the deep Dayugou bauxite deposit will be aguide for bauxite ore prospecting in Henan province.
引文
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[3]戴耕.世界铝市场回顾与展望[J].世界有色金属,2003(12):47-48.
[4]吴国炎,姚公一,吕夏.河南铝土矿床[M].北京:中国地质大学,2009:41-49.
[5]温同想.河南石炭纪铝土矿地质特征[J].华北地质矿产杂志,1996,11(4):491-579.
[6]廖士范,梁同荣.中国铝土矿地质学[M].贵阳:贵州科技出版社,1991:7-11.
(1)戴耕.铝资源分析[R],郑州:河南省国土资源科学研究院,1991.