巴布亚新几内亚Feni岛群Ambitle岛富ree碱性火山岩的岩石学和地球化学

IF 2.4 Q2 GEOSCIENCES, MULTIDISCIPLINARY Geosciences (Switzerland) Pub Date : 2023-11-06 DOI:10.3390/geosciences13110339
Olive L. Ponyalou, Michael G. Petterson, Joseph O. Espi
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引用次数: 0

摘要

Feni岛群的Ambitle位于巴布亚新几内亚东北部美拉尼西亚岛弧的西北走向的tabar - lihirr - tanga - Feni (TLTF)火山岛链内。TLTF链以其碱性岩浆作用、地热活动、铜金矿化和世界级金矿而闻名。虽然其地球化学模式具有岛弧特征(即高LILE和低HFSE),但TLTF火山活动与较老的美拉尼西亚弧俯冲系统没有直接关系。然而,它可能受到与较早俯冲有关的源幔交代作用的影响。本研究的目的是:(1)在TLTF构造演化的背景下呈现和解释芬尼的岩石学、矿物学和地球化学数据;(2)提出芬尼火山岩的地球动力学、岩石成因模型。本研究使用的主要方法是野外测绘和采样、光学显微镜岩石学分析、XRF和ICP MS全岩地球化学分析以及电子显微探针矿物学分析。主要岩石类型为含长石玄武岩、粗面玄武岩、音质软玉岩、粗面安山岩和粗面英石岩。在原始基性岩套中发现的矿物包括橄榄石、透辉石、辉长石、辉长石、安山石、斜长石、霞石和白长石,而在更进化的中长石和长质浅浅岩套中则含有角闪石、钠长石、正长石、黑云母以及稀有的石英或长石。角闪孔成分主要为镁促生岩,在多压条件下形成少量寄生岩。辅助矿物包括磷灰石、钛矿和钛磁铁矿。本文认为,灰岩同化后的分馏结晶作用可能是阿姆毕尔火山岩地球化学演化的主导过程。镁基性火山岩中斜辉石分馏作用占主导地位,角闪石分馏作用是中间套中主要的岩石学过程,轻稀土富集、重稀土和重稀土亏缺证明了这一点。Feni岩浆相对于邻近弧也富含稀土元素。该研究具有全球意义,因为碱性岩浆是铜、金和稀土的重要来源,是绿色能源和现代技术的关键元素。
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The Petrology and Geochemistry of REE-Enriched, Alkaline Volcanic Rocks of Ambitle Island, Feni Island Group, Papua New Guinea
Ambitle in the Feni Island Group is located within the NW trending Tabar–Lihir–Tanga–Feni (TLTF) volcanic island chain, Melanesian Arc, northeastern Papua New Guinea. The TLTF chain is renowned for its alkaline magmatism, geothermal activity, copper–gold mineralization, and world-class gold mining. Although its geochemical patterns indicate island arc signatures (i.e., high LILE and depleted HFSE), TLTF volcanism is not directly related to the older Melanesian Arc subduction system. However, it may have been influenced by source mantle metasomatism linked to the older subduction. The purpose of this study is to (1) present and interpret the petrographic, mineralogical, and geochemical data from Feni within the context of the tectonic evolution of the TLTF and (2) propose a geodynamic, petrogenetic model for the Feni volcanic rocks. The key methodologies used in this study are field mapping and sampling, petrographic analysis using the optical microscope, whole-rock geochemical analysis via XRF and ICP MS, and mineralogical analysis using an electron microprobe. The main rock types sampled in this study include feldspathoid-bearing basalt, trachybasalt, phonotephrite, trachyandesite, and trachydacite. Minerals identified include forsteritic olivine, diopside, augite, labradorite, andesine, anorthitic plagioclase, nepheline, and leucite in the primitive mafic suites, whereas the more evolved intermediate and felsic hypabyssal suites contain amphibole, albite, orthoclase, biotite, and either rare quartz or feldspathoids. Amphibole composition is primarily magnesiohastingsite with minor pargasite formed under polybaric conditions. Accessory minerals include apatite, titanite, and Ti-magnetite. We propose that limestone assimilation followed by fractional crystallization are plausible dominant processes in the geochemical evolution of the Ambitle volcanics. Clinopyroxene fractionation is dominant in the mafic volcanics whereas hornblende fractionation is a major petrologic process within the intermediate suites proven by the enrichment of LREE and depletions in MREE and HREE. Feni magmas are also highly enriched in REEs relative to neighboring arcs. This study is globally significant as alkaline magmas are important sources of Cu, Au, and REE as critical elements for green energy and modern technology.
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来源期刊
Geosciences (Switzerland)
Geosciences (Switzerland) Earth and Planetary Sciences-Earth and Planetary Sciences (all)
CiteScore
5.30
自引率
7.40%
发文量
395
审稿时长
11 weeks
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