Control of Structure on the Distribution and Morphological Characteristics of Ore Bodies in Hainan Shilu Iron Deposit
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摘要:
石碌复向斜是石碌铁矿的主控构造，既有弯滑弯流褶皱（顺层剪切作用形成）的特征，也有中和面褶皱的特征。本文通过总结石碌矿区铁矿体的分布和形态发现：铁矿体主要分布区位于次级褶皱的翼部，相当于弯滑弯流褶皱的剪切应变区（简单剪切应变）；次要分布区为次级褶皱的核部，相当于中和面褶皱的挤压区（纯剪应变）；铁矿体，特别是富铁矿体在纵弯褶皱翼部多为扁长透镜体状、似层状，与顺层剪切作用中应变透镜体形态接近；在核部则多为粗短透镜状或不规则团块状，也与中和面褶皱作用中挤压应变透镜体形态接近。石碌复式向斜不仅改造、控制了铁矿体的形态和分布，还与富铁矿体的富集和形成密切相关。石碌矿区铁矿体的分布和形态特征反映了纵弯褶皱的控矿规律，是纵弯褶皱成矿作用的宏观反映，也是纵弯褶皱成矿的一个宏观证据。
Abstract:The Shilu syncline is the main controlling structure of the Shilu iron mine, which is characterized by both flexural slip/flexural flow folds (formed by bedding shear) and neutral-plane folds. Based on the distribution and morphology of iron ore bodies in the Shilu mine, it is found that the main distribution area of iron ore bodies is located in the flanks of the secondary folds, which is equivalent to the shear strain zone of the flexural slip/flexural flow folds(simple shear strain). The secondary distribution area is located in the core of the secondary folds, which corresponds to the compressional strain region (pure shear strain) of the neutral-plane folds. The iron bodies, especially the rich ones, are mostly elongated lens-like and lamellar in the flanks of the longitude-bending folds, which are similar to the strain lens in bedding shearing. In the core area, the ore bodies occur mostly in coarse lenticular or irregular mass, which is also in close relationship to the shape of the compressional strain lens in the folding of the neutral-plane. The Shilu complex syncline not only modifies and controls the form and distribution of the iron ore bodies but also contributes to the enrichment and formation of rich iron bodies. The distribution and morphological characteristics of iron ore bodies in the Shilu mining area reflect the metallogenic law of longitudinal folds, which is a macroscopic reflection of longitudinal folds mineralization and macroscopic evidence of longitudinal folds mineralization.
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