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首页> 外文期刊>Journal of Asian earth sciences >Tin mineralization in the Dajing tin-polymetallic deposit, Inner Mongolia, China
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Tin mineralization in the Dajing tin-polymetallic deposit, Inner Mongolia, China

机译：内蒙古大井锡多金属矿床中的锡矿化

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摘要

Dajing is a large-scale tin-polymetallic deposit that hosts the largest tin mine in North China. It is a hydrothermal vein-type deposit containing Sn, Cu, Pb, Zn, Ag, and minor components Co and In. The deposit consists of more than 690 veins hosted within Upper Permian sedimentary rocks. Three mineralization stages and six ore types are recognized with cassiterite constituting the dominant tin mineral. The SnO_2 content of cassiterite increases in the sequence of mineralization stages shear-deformation → cassiterite-quartz → cassiterite-sulfide (or chalcopyrite-pyrite) stage, while the content of FeO, TiO_2, Nb_2O_5, Ta_2O_5, and In_2O_5 tends to decrease with increases in NiO and Ga_2O_5. It is considered that the negative correlation between SnO_2 and FeO, Nb_2O_5, Ta_2O_5, and In_2O_5 results from elemental substitutions. The early stage cassiterite is much richer in Ta and the later stage cassiterite is much poorer in Ti and Fe than is usual in hydrothermal vein type tin deposits. This is interpreted to indicate that the component of early stage cassiterite reflects a granitic magma source while the composition of later stage cassiterite has a more obvious strata source. The compositional variation of cassiterite corresponds to decreasing crystallization temperatures within each stage and between sequential stages with time. The characteristics of REE in cassiterite from two stages are in accord with that of subvolcanic rocks and the Linxi formation. It suggests that tin transported during the cassiterite-quartz stage may have originated from subvolcanic dikes (e.g., dacite porphyry), while in the cassiterite-sulfide stage, tin may have been derived from wallrock (e.g. siltstone) of the Upper Permian-age Linxi Formation.
机译：大井是大型的锡多金属矿床，拥有华北最大的锡矿。它是含有锡，铜，铅，锌，银和微量元素钴和铟的热液脉型矿床。该矿床由上二叠纪沉积岩中的690多条脉组成。锡石是构成主要锡矿的三个矿化阶段和六个矿石类型。锡石的SnO_2含量在成矿阶段剪切变形→锡石-石英→锡石-硫化物（或黄铜矿-黄铁矿）阶段依次增加，而FeO，TiO_2，Nb_2O_5，Ta_2O_5和In_2O_5的含量则随着增加而降低。在NiO和Ga_2O_5中。可以认为，SnO_2与FeO，Nb_2O_5，Ta_2O_5和In_2O_5之间的负相关性是由元素取代引起的。与热液脉管型锡沉积物中的通常情况相比，钛铁矿中的早期锡铁矿中的钽含量高得多，而后期锡铁矿中的钛和铁含量低得多。这被解释为表明，早期锡石的成分反映了花岗岩岩浆源，而后期锡石的成分具有更明显的地层源。锡石的成分变化与每个阶段内以及连续阶段之间随时间降低的结晶温度相对应。两阶段锡铁矿中的稀土元素特征与亚火山岩和临溪组相一致。这表明锡石-石英阶段运移的锡可能起源于亚火山岩（例如达铁矿斑岩），而锡铁-硫化物阶段锡可能源自上二叠纪-临溪的围岩（如粉砂岩）。编队。

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