發(fā)布時間：2018-06-10 21:22

  本文選題：基性—超基性巖 + 側(cè)向分帶　； 參考：《地質(zhì)論評》2017年04期

【摘要】：在基性—超基性巖中,特別是那些含礦巖體,常常發(fā)育有原生的側(cè)向分帶,傳統(tǒng)的重力分異理論無法用原地分異機制對這一現(xiàn)象進行合理解釋;新的硫化物成礦模型同樣不能令人信服。我們在對重力結(jié)晶分異的研究中發(fā)現(xiàn),對流干擾下的重力結(jié)晶分異可以形成側(cè)向分帶。研究采用動力學(xué)分析的方法,深入了解對流干擾下巖漿重力分異作用中的顆粒行為。在動力學(xué)分析中,考慮了前人研究中普遍忽略的伯努利效應(yīng)。研究表明,伴隨著快速對流干擾的巖漿重力結(jié)晶分異可以產(chǎn)生側(cè)向分離效應(yīng),使顆粒趨于在側(cè)壁附近快速堆積。側(cè)分離效應(yīng)和側(cè)壁冷卻效應(yīng)一起迫使循環(huán)向熱流上升中心方向后退,形成側(cè)向分帶巖石。由于對流通常只發(fā)生在巖漿侵位后結(jié)晶分異的早期高溫階段,與銅鎳硫化物熔離的階段相吻合,因此,銅鎳硫化物的礦化通常與對流干擾下的重力分異密切相關(guān)。最后以一個實例解釋側(cè)向分帶和成礦作用的形成機制。研究成果突破了傳統(tǒng)關(guān)于重力分異的認識,為深入認識巖漿演化及指導(dǎo)找礦提供新的思路。
[Abstract]:In basic ultrabasic rocks, especially those containing ore bodies, the primary lateral zoning is often developed, and the traditional theory of gravity separation can not be reasonably explained by the mechanism of ground differentiation; the new sulfide metallogenic model is not convincing. We found in the study of the fractionation of gravity crystallization and convective interference. The gravitational crystallization differentiation can form the lateral zoning. The dynamic analysis method is used to study the granular behavior in the magmatic gravity differentiation under the convective interference. In the dynamic analysis, the Bernoulli effect, which is generally neglected in previous studies, is considered. The study shows that the magmatic crystallization differentiation with the rapid convection interference is accompanied by the rapid convection. The lateral separation effect can lead to rapid accumulation of particles near the side wall. Side separation effect and side wall cooling effect compel the cycle to retreat to the direction of the central heat flow and form lateral zoning rocks. Because convection usually occurs only at the early stage of high temperature after magma emplacement, it is in the phase of melting with copper and nickel sulfide. Therefore, the mineralization of copper and nickel sulfide is closely related to the gravity differentiation under the convective interference. Finally, an example is made to explain the formation mechanism of lateral zoning and mineralization. The research results break through the traditional understanding of gravity differentiation, and provide a new way of thinking for deep understanding of magma evolution and guiding the prospecting.
【作者單位】： 中國有色桂林礦產(chǎn)地質(zhì)研究院有限公司;中國地質(zhì)科學(xué)院巖溶地質(zhì)研究所國土資源部/廣西壯族自治區(qū)巖溶動力學(xué)重點實驗室;
【基金】：廣西區(qū)大規(guī)模地質(zhì)找礦項目“廣西恭城縣五福錫鉭鈮礦普查”(編號:[2010]604)的資助~~
【分類號】：P588.124;P611

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