...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Contributions to Mineralogy and Petrology >Granitic magmas with I-type affinities, from mainly metasedimentary sources: the Harcourt batholith of southeastern Australia
【24h】

Granitic magmas with I-type affinities, from mainly metasedimentary sources: the Harcourt batholith of southeastern Australia

机译：具有I型亲和力的花岗岩岩浆，主要来自MetaseDary来源：澳大利亚东南部的Harcourt Batholith

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The high-K, calcalkaline granitic rocks of the 370Ma, post-orogenic Harcourt batholith in southeastern Australia have I-type affinities but are mildly peraluminous and have remarkably radiogenic isotope characteristics, with Sr-87/Sr-86(t) in the range 0.70807 to 0.714121 and epsilon Nd-t in the range -5.6 to -4.3. This batholith appears to be a good example of magmas that were derived through partial melting of distinctly heterogeneous source rocks that vary from intermediate meta-igneous to mildly aluminous metasedimentary rocks, with the balance between the two rock types on the metasedimentary side. Such transitional S-I-type magmas, formed from mainly metasedimentary source rocks, may be more common thanis generally realised. The Harcourt batholith also contains mainly granodioritic igneous microgranular enclaves (IMEs). Like their host rocks, the IMEs are peraluminous and have rather radiogenic isotope signatures (Sr-87/Sr-86(t) of 0.71257-0.71435 and epsilon Nd-t of -7.3 to -4.3), though some are hornblende-bearing. Origins of these IMEs by mixing a putative mantle end member with the host granitic magma can be excluded because of the variability in whole-rock isotope ratios and, for the same reason, the IME magmas cannot represent quench cumulates (autoliths) from the host magmas. Less abundant monzonitic to monzosyenitic IMEs cannot represent accumulations of magmatic biotite and/or alkali feldspar because K-feldspar is absent, and there is no co-enrichment of K2O and FeO+MgO, nor can they be mixtures of anything plausible with the host-rock magma. The granodioritic IMEs probably originated through high degrees of assimilation of a range of crustal materials (partial melts?) by basaltic magmas in the deep crust, and the monzonitic IMEs as melts of enriched subcontinental mantle. Such enclave suites provide little or no information on the chemical evolution of their host granitic rocks.
机译：370mA的高k，Calcallaline花岗岩岩石，澳大利亚东南部的奥林菌盆地狼人具有I型亲和力，但具有轻微的灭菌性，并且具有显着的放射性同位素特性，在该范围内具有SR-87 / SR-86（T） 0.70807至0.714121，εnd-t的范围为-5.6至-4.3。该浴袍似乎是岩浆的一个很好的例子，它是通过偏离明显的异质源岩石来源的岩浆的一个很好的例子，这些烃源岩石中的中间型烃基对轻微的铝制的元岩石变化，具有在元化方面的两种岩石类型之间的平衡。这种过渡的S-I型岩浆，主要由METASEDARY SOURCE ROCESS形成，可能更常见，通常意识到。 Harcourt Batholith还含有GranodioritItic Ignegrous Microgranular Faccaves（IME）。与他们的主体岩石一样，IME是灭菌的并且具有相当辐射的同位素签名（SR-87 / SR-86（T），0.71257-0.71435和εnD-T的-7.3至-4.3），但有些是Horlblende-uck。通过将推定的地幔端构件与主体花岗岩岩浆混合，可以排除这些IME的起源，因为全岩同位素比的可变性，并且出于同样的原因，IME岩浆不能代表来自主体岩浆的淬火累积（高硅思） 。较为丰富的蒙扎塞至蒙泽塞IME不能代表岩浆生物素和/或碱金属石的累积，因为K-Feldspar不存在，并且没有共同富集K2O和FeO + MgO，也不是它们的混合物，它们与主持人合理的混合物摇滚岩浆。 Granodioritic IMES可能来自深层地壳中的一系列地壳材料（部分熔体→）的高度同化，并且蒙扎塞IMES作为富集的亚平坦地幔的熔化。这种飞地套房几乎没有关于其主体花岗岩岩石的化学演进的信息。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号