Circum-Caribbean Granitoids: Characteristics and Origin
Circum-Caribbean Granitoids: Characteristics and Origin
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环加勒比花岗岩：特征和起源
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
Jolly WayneT.
中科院分区：
文献类型：
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作者：
Lidiak EdwardG.;Jolly WayneT.
加勒比花岗岩类出现在一系列广泛的岩浆弧中，这些岩浆弧是在晚白垩纪开始的主要海洋板块汇聚和俯冲时期发展起来的。对加勒比海花岗岩类的评价表明，两套主要花岗岩类广泛分布。低钾花岗岩包括辉长岩、闪长岩、石英闪长岩、闪长岩和闪长岩。第二种主要类型的钾含量明显更高，主要由石英二辉长岩和花岗闪长岩组成，但也包括二辉长岩、石英二辉长岩和花岗岩。两组都含有过渡到另一组的岩石。花岗岩类是广泛的加勒比海钙碱性组合的一部分，包括低钾、中钾和高钾岩石。岛弧拉斑岩和正钾钙碱组成反映了造山带花岗岩内的地球化学连续性。在FeOT/MgO和AFM图上，花岗岩类（包括低钾岩石）位于钙碱性场内。碱石灰指数属…
Caribbean granitoids occur among a series of widespread magmatic arcs that developed during a period of major oceanic plate convergence and subduction that began in Late Cretaceous time. Evaluation of Caribbean granitoids reveals that two main suites of granitoids are widespread. Low-K granitoids, including gabbro, diorite, quartz diorite, tonalite, and trondhjemite, comprise one of these suites. The second main type is distinctly more potassic and consists primarily of quartz monzodiorite and granodiorite, but also includes monzodiorite, quartz monzonite, and granite. Both groups contain rocks that are transitional to the other group. The granitoids are part of an extensive Caribbean calc-alkaline assemblage that includes low-K, medium-K, and high-K rocks. Island-arc tholeiitic and normal-K calc-alkalic compositions reflect geochemical continua within the orogenic granitoids. The granitoids (including low-K rocks) lie within the calc-alkaline field on FeOT/MgO and AFM diagrams. Alkali-lime indices genera...