Metamorphosed Ultramafic and Mafic Lithoclasts and Detrital Minerals from Sandstones of Clastic Ophiolitic Deposits of the Rassokha Terrane: A Setting of Formation of the Chersky Range Ophiolites

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
G. V. Ledneva, B. A. Bazylev, S. N. Sychev, A. V. Rogov
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Abstract

Ophiolite-derived clastic rocks of the Rassokha terrane in the Chersky Range of the Verkhoyansk−Kolyma folded area were studied to obtain representative characteristics of the eroded source metamorphosed ultramafic and mafic rocks, to gain an insight into the possible geodynamic setting in which the protoliths of these rocks were formed, and to identify the possible source of the eroded material. The composition of lithoclasts and detrital minerals of the serpentinite and listwanite sandstones suggests that their source was composed of serpentinite, chloritite, listwanite, and dolomite rocks and that this source was proximal. Prior to the source erosion, the ultramafic and mafic rocks were metamorphosed and recrystallized, listwanite was formed, and the ultramafic rocks were tectonically disintegrated and combined with units of carbonate rocks (dolomite). Ultramafic rocks from lithoclasts experienced allochemical metamorphic retrogression during at least the latest stage of their serpentinization in a nonoceanic setting, where also the listwanite was formed. The Late Neoproterozoic ophiolites of the collisional belt of the Chersky Range were the most probable source for the protoliths of the clastic material. The protoliths of the ophiolite rock were probably formed in a backarc setting. Considered together with the published ages, our data indicate that relics of suprasubduction oceanic lithosphere of the Neoproterozoic basin occurred in the Chersky Range.

Abstract Image

Abstract Image

拉索卡地层碎屑蛇绿岩沉积砂岩中变质的超基性和镁基性岩屑和碎屑矿物:切尔斯基山脉蛇绿岩的形成背景
摘要 对上霍扬斯克-科雷马褶皱区切尔斯基山脉拉索卡岩系的蛇绿岩衍生碎屑岩进行了研究,以获得侵蚀源变质超基性岩和黑云母岩的代表性特征,深入了解这些岩石原岩形成的可能地球动力环境,并确定侵蚀物质的可能来源。蛇纹石砂岩和鳞片砂岩的岩石碎屑和碎屑矿物成分表明,它们的来源是由蛇纹石、绿泥石、鳞片砂岩和白云石岩石组成的,而且这个来源很近。在岩源侵蚀之前,超基性岩和黑云母岩经过变质和重结晶,形成了鳞片皖石,超基性岩经过构造解体,与碳酸盐岩(白云岩)单元结合在一起。来自碎屑岩的超基性岩至少在其蛇绿岩化的最近阶段经历了分配化学变质逆退,在非大洋环境中也形成了鳞片岩。切尔斯基山脉碰撞带的新近纪晚期蛇绿岩是碎屑物质原岩的最可能来源。蛇绿岩的原岩很可能是在弧后环境中形成的。结合已公布的年龄,我们的数据表明新近纪盆地的超俯冲洋岩石圈遗迹出现在切尔斯基山脉。
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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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