西南三江成矿带碰撞后斑岩成矿岩浆交代地幔成因

IF 2.2 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Terra Nova Pub Date : 2023-04-10 DOI:10.1111/ter.12653

Hongda Hao, Jung‐Woo Park

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引用次数: 0

摘要

我们对中国西南三江成矿带具有代表性的碰撞后成矿和贫瘠套房的岩浆源进行了约束。与地壳熔体相比，矿石伴生岩套通常具有更高的Mg#、Cr和Ni含量。此外，它们显示了广泛的全岩Nd和锆石Hf同位素，与该地区俯冲改性地幔衍生的碱性火山岩相似。结合地球化学模型，我们认为与矿石相关的套房主要来源于俯冲交代地幔的部分熔体，通过部分结晶作用。相比之下，贫瘠套房的主要特征是Mg#、Cr和Ni含量较低，与地壳熔体相当，并且富含全岩Nd和锆石Hf同位素，表明交代作用的下地壳起源。在后碰撞斑岩成矿过程中，不同的岩浆源在控制当代成矿和贫瘠岩浆岩套的肥力方面发挥着重要作用。

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A metasomatised mantle origin for post‐collisional porphyry ore‐forming magmas in the Sanjiang metallogenic belt, Southwest China

We constrain the magma sources of representative post‐collisional ore‐associated and barren suites in the Sanjiang metallogenic belt, Southwest China. The ore‐associated suites generally have higher Mg# and Cr and Ni contents than the crustal melts. Also, they show wide ranges of whole‐rock Nd and zircon Hf isotopes that are similar to the subduction‐modified mantle‐derived alkaline volcanic rocks in the region. Combing with the geochemical model, we suggest that the ore‐associated suites dominantly originated from partial melts of subduction‐metasomatised mantle by fractional crystallisation. In contrast, the barren suites are mainly characterised by low Mg# and Cr and Ni contents that are comparable to the crustal melts and they have enriched whole‐rock Nd and zircon Hf isotopes, indicating a metasomatised lower crustal origin. The different magma sources play an important role in controlling the fertility of contemporary ore‐associated and barren magmatic suites during post‐collisional porphyry ore formation.

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来源期刊

Terra Nova 地学-地球科学综合

CiteScore

4.80

自引率

8.30%

发文量

审稿时长

2.3 months

期刊介绍： Terra Nova publishes short, innovative and provocative papers of interest to a wide readership and covering the broadest spectrum of the Solid Earth and Planetary Sciences. Terra Nova encompasses geology, geophysics and geochemistry, and extends to the fluid envelopes (atmosphere, ocean, environment) whenever coupling with the Solid Earth is involved.