| 铀矿床构造模式及其找矿意义 |
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| 引用本文： | 贺伟建.铀矿床构造模式及其找矿意义[J].矿床地质,1987,6(1):79-87. |
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| 作者姓名： | 贺伟建 |
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| 作者单位： | 中南地质勘探局 |
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| 摘 要： | 本文将铀矿床赋存的构造形态划分为层控、断控和体控三种模式。层控模式包括沉积成岩阶段形成的层状铀矿床、顺层发育的后生带状铀矿床和与不整合面有关的铀矿床;断控模式包括各种产于断裂带(层间断层除外)的铀矿床;体控模式的铀矿床则分为与侵入体构造和火山机构有关的两种情况。所有模式均具有三个特性,即模式保存的完整性,模式发展的阶段性和模式形成的复合性。铀矿床的构造模式特征对矿床评价具指导意义。
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| 关 键 词： | 铀矿床 构造模式 层控模式 断控模式 体控模式 |
Some Structural Models For Uranium Deposits And Their Implicatlojns In Ore Prospecti'ng |
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| Abstract: | Structural forms of uranium deposits are divided in this paper into three models. i.e. strtabound, fault-bounded and body-controlled types. The strata-bound model (Fig.1) includes stratiform uranium deposits formed at the sedimentary-diagenetic stage, epigenetic banded uranium deposits comformable to the stratification and the uranium deposits related to unconformity; the fault-bounded model (Fig.2) comprises all the uranium deposits occurring in various faulted zones except for those in interstratal faults; the body-controlled model (Figs.3. 4) consists of uranium deposits associated with structures of intrusive bodies and those related to volcanic apparatus. These three models are all characterized by completeness of preservation (Fig.5), development by stages (Fig.6) and multiplicity in composition (Fig.7). The ore-controlling factors of these three kinds of model also show characters of mutual infiltration and transition. Therefore, it is sometimes difficult to distinguish one from another in a given deposit. The implication of the structural model for uranium deposits in evaluation of one deposits is as follows: (l) the best prospect areas, where orebodies are well preserved at or near the surface, mineralization is controlled by multiple factors and has been uninterruptedly subjected to polystage transformation; (2) fairly promising areas, where orebodies are largely preserved below the surface, ores have been formed by more than a single factor, i.e., they have undergone both transformation and disintegration; (3) areas of little prospect where orebodies have been considerably denuded, mineralization is basically controlled by a single factor, and the orebodies preserved are remnants after disintegration. |
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