Petrology and Geochemistry of Post-Collisional Early Miocene Volcanism in the Karacadag Area(Central Anatolia,Turkey)
Petrology and Geochemistry of Post-Collisional Early Miocene Volcanism in the Karacadag Area（Central Anatolia,Turkey）作者机构：Department of Geological EngineeringSelcuk University
出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报(英文版))
年 卷 期：2011年第85卷第5期
页 面：1100-1117页
核心收录：
学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 0819[工学-矿业工程] 07[理学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0816[工学-测绘科学与技术]
主 题：post-collision calcalkaline Sr-Nd isotopes Karacadag Central Anatolia
摘 要：Early Miocene（ca.21-18 Ma） volcanism in the Karacadag area comprises three groups of volcanic rocks:（1） calcalkaline suite（andesitic to rhyolitic lavas and their pyroclastics）,（2） mildly-alkaline suite（alkali basalt,hawaiite,mugearite,benmoreite and trachydacite）,and（3） a single trachyandesitic flow *** observations,40Ar/39Ar ages and geochemical data show that there was a progressive temporal transition from group 1 to 3 in a post-collisional tectonic *** calcalkaline suite rocks with medium-K in composition resemble those of subduction-related lavas, whereas the mildly-alkaline suite rocks having a sodic tendency（Na2O/K2O=l.5-3.2） resemble those of within-plate *** element and Sr-Nd isotopic characteristics of the suites suggest that the lithospheric mantle beneath the Karacadag area was heterogeneously enriched by two processes before collision:（1） enrichment by subduction-related processes,which is important in the genesis of the calcalkaline volcanism,（2） enrichment by small degree melts from the astenosphere,which dominates the mildly alkaline *** of the enriched lithosphere by either delamination following collision and uplift or removal of the subducted slab following subduction and collision（i.e.,slab breakoff） is the likely mechanism for the initiation of the post-collision volcanism.
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