磷灰石 Lu-Hf 地质年代学的创新为努纳破坏时期澳大利亚南部的铜矿系统提供了新机遇

IF 4.4 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Jie Yu, Martin Hand, Justin L. Payne, Laura J. Morrissey, Alexander Simpson, Stijn Glorie, Yan-Jing Chen
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引用次数: 0

摘要

前寒武纪氧化铁铜金(IOCG)系统通常经历了多次成矿和构造热事件,确定其时间和地球动力学框架具有挑战性。南澳大利亚奥林匹克铜金矿省的世界级 IOCG 矿床以赤铁矿为主,形成于上地壳,而花岗岩岩层中以磁铁矿为主的铜矿床被认为是巨型 IOCG 系统的深部表现。然而,新的原位Lu-Hf磷灰石地质年代学的应用揭示了磁铁矿赋存的铜矿化要年轻得多,与众所周知的约1590 Ma的高勒克拉通IOCG系统无关。铜矿化之前的花岗岩的磷灰石Lu-Hf年龄为1490 Ma。含铜流体的渗入导致磷灰石重结晶、LREE移动和次生独居石的形成。同矿化磷灰石的Lu-Hf年龄为1460 Ma,与次生独居石的U-Pb年龄(约1460 Ma)一致。与磷灰石的原位lu-hef年龄相比,所有类型的磷灰石都产生了约1460 Ma的单一铀-铅年龄,这表明在高温至中温岩石系统中,lu-hef比铀-铅能够保存更完整的磷灰石形成史。成矿时间与努纳破碎开始的时间相吻合,这代表了澳大利亚南部矿物系统形成的一个以前未被认识到的驱动因素,它将铜安装在以前在漫长的花岗岩级构造事件中脱水的地壳中。在通常被认为没有远景的岩石中发现这一铜矿系统表明,大陆断裂可以使原本没有远景的地壳中的金属系统重新焕发活力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Innovation in apatite Lu-Hf geochronology opens new opportunity for copper systems in southern Australia during the Nuna destruction

Innovation in apatite Lu-Hf geochronology opens new opportunity for copper systems in southern Australia during the Nuna destruction

Precambrian iron oxide copper-gold (IOCG) systems have commonly experienced multiple mineralising and tectonothermal events and identifying their timing and geodynamic framework is challenging. World-class IOCG deposits in the Olympic Cu-Au Province, South Australia, are dominated by hematite and formed in the upper crust, while the magnetite-dominated Cu deposits hosted in granulite facies rocks are considered to represent the deeper expression of giant IOCG system. However, the application of novel in-situ Lu-Hf apatite geochronology reveals the magnetite-hosted Cu mineralisation is significantly younger and unrelated to the well-known ~ 1590 Ma Gawler Craton IOCG systems. Apatite Lu-Hf ages from the granulite that predates Cu mineralisation give ages of 1490 Ma. Infiltration of Cu-bearing fluids resulted in recrystallisation of apatite, LREE mobilisation and formation of secondary monazite. Lu-Hf ages for syn-mineralisation apatite give 1460 Ma, consistent with c. 1460 Ma U-Pb ages from secondary monazite. In contrast to the apatite in situ Lu-Hf ages, all apatite types produce a single U-Pb age of c. 1460 Ma, demonstrating the ability of Lu-Hf to preserve a more complete history of apatite formation than U-Pb in high- to medium-temperature rock systems. The timing of mineralisation coincides with the onset of Nuna fragmentation, representing a previously unrecognised driver for mineral system formation in southern Australia that installed Cu in crust previously dehydrated during a long history of granulite-grade tectonic events. The recognition of this Cu system in rocks generally considered unprospective shows that continental breakup can rejuvenate metallic systems in otherwise unprospective crust.

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来源期刊
Mineralium Deposita
Mineralium Deposita 地学-地球化学与地球物理
CiteScore
11.00
自引率
6.20%
发文量
61
审稿时长
6 months
期刊介绍: The journal Mineralium Deposita introduces new observations, principles, and interpretations from the field of economic geology, including nonmetallic mineral deposits, experimental and applied geochemistry, with emphasis on mineral deposits. It offers short and comprehensive articles, review papers, brief original papers, scientific discussions and news, as well as reports on meetings of importance to mineral research. The emphasis is on high-quality content and form for all articles and on international coverage of subject matter.
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