Subduction and Oceanic Magmatism Records in Plutonic Rocks of the Kamchatsky Mys Ophiolite, Eastern Kamchatka

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Petrology Pub Date : 2023-06-28 DOI:10.1134/S0869591123030025
B. A. Bazylev, M. V. Portnyagin, D. P. Savelyev, G. V. Ledneva, N. N. Kononkova
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Abstract

The paper presents petrographic, mineralogical, and geochemical data on dunites, pyroxenites, peridotites, and gabbroids of the Kamchatsky Mys ophiolite. These data were acquired to distinguish cogenetic assemblages of igneous rocks, gain an insight into their geodynamic settings, and test various criteria of genetic links between the different magmatic rocks of ophiolites. The ultramafic and mafic rocks are shown to belong to two series, which differ in the compositions of the primary minerals, bulk rocks, and estimated trapped melts. The rocks of these series are found out to have been produced by geochemically different melts in different geodynamic settings, and during different episodes of mantle magmatism. The rocks of the high-Ti series (gabbro of the Olenegorsk massif, dunite and melanogabbro xenoliths in them, and vein gabbro in these xenoliths) crystallized from N-MORB melts in an oceanic spreading center. The rocks of the low-Ti series (dunite, pyroxenite, and gabbro veins in the residual spinel peridotites of the Mount Soldatskaya massif, as well as pyroxenite, peridotite, and gabbro alluvium and diluvium in the central and western parts of the peninsula) crystallized from water-rich boninite melts in relation to initial subduction magmatism. Taken into account the absence of boninite lavas from the Kamchatsky Mys ophiolite, the plutonic ultramafic rocks (including the rocks of the veins) might be the only evidence of subduction boninitic magmatism in the ophiolites. It was demonstrated that conclusions about the geodynamic settings of plutonic ultramafic and mafic rocks and recognition of cogenetic relations of these rocks with spatially associated basalts are more reliable when derived from the compositions of the trapped melts, which are estimated from their bulk geochemistry and primary mineral compositions, than when they are based on the mineral compositions only.

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堪察加东部堪察加梅斯蛇绿岩深成岩中的俯冲和大洋岩浆作用记录
本文介绍了堪察加梅斯蛇绿岩的泥质岩、辉石岩、橄榄岩和辉长岩的岩石学、矿物学和地球化学资料。获取这些数据是为了区分火成岩的共成组合,了解它们的地球动力学背景,并测试蛇绿岩不同岩浆岩之间的成因联系的各种标准。超镁铁质岩和基性岩分属于两个系列,它们在原生矿物、大块岩石和估计的圈闭熔体组成上存在差异。这些系列的岩石在不同的地球动力学背景下,在不同的地幔岩浆活动时期,由地球化学上不同的熔体形成。高钛系列岩石(奥列涅戈尔斯克地块的辉长岩、其中的暗长辉长岩和黑长辉长捕虏体以及这些捕虏体中的脉状辉长岩)在一个海洋扩张中心的N-MORB熔体中结晶。低钛系列岩石(Soldatskaya山地块残余尖晶石橄榄岩中的泥质、辉石岩和辉长岩脉,以及半岛中部和西部的辉石岩、橄榄岩和辉长岩冲积层和洪积层)是在初始俯冲岩浆作用下由富水的博长岩熔体结晶而成的。考虑到堪察加梅斯蛇绿岩中不存在博英质熔岩,深成超基性岩石(包括脉状岩石)可能是蛇绿岩中俯冲博英质岩浆作用的唯一证据。研究结果表明,通过圈闭熔体的整体地球化学特征和原生矿物组成估算其地球动力学背景,以及与空间伴生玄武岩的同成关系,要比仅根据矿物组成推断更为可靠。
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来源期刊
Petrology
Petrology 地学-地球科学综合
CiteScore
2.40
自引率
20.00%
发文量
27
审稿时长
>12 weeks
期刊介绍: Petrology is a journal of magmatic, metamorphic, and experimental petrology, mineralogy, and geochemistry. The journal offers comprehensive information on all multidisciplinary aspects of theoretical, experimental, and applied petrology. By giving special consideration to studies on the petrography of different regions of the former Soviet Union, Petrology provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.
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