Tracking the Caribbean Magmatic Evolution: The British Virgin Islands as a Transition Between the Greater and Lesser Antilles Arcs

IF 2.9 2区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Noémie Bosc, Delphine Bosch, Mélanie Noury, Olivier Bruguier, Lény Montheil, Douwe J. J. van Hinsbergen, Jean-Jacques Cornée, Jonathan Outin, Mélody Philippon
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Abstract

The British Virgin Islands (BVI) archipelago, located between the Greater Antilles and the Lesser Antilles, is a key location to study the geodynamic evolution of the Caribbean plate. Geochemistry of the studied samples reveals typical volcanic arc signatures, including a calc-alkaline affinity, strong negative HFSE anomalies, and LILE enrichment. The ɛHf values are homogeneous, indicative of a MORB-type mantle. Magmas were sourced from a homogeneous mantle wedge with less than 2% slab-derived sediment inputs, dominated by aqueous fluids. A concomitant melt component has been detected in the Peter and Norman Islands. U-Pb dating emphasizes an active magmatic period spanning over ca. 13 Myr (43–30 Ma), with a NE/SW decreasing age gradient. Thermobarometry data display a SW increasing emplacement depth from ∼6 to 13 km. Compared to the Greater and Lesser Antilles, this archipelago shows strong similarities with the extinct northern Lesser Antilles arc in terms of source and age. A geodynamical evolution model is proposed in which this archipelago represents a transition between the Greater and the Lesser Antilles arcs. The Oligocene cessation of magmatism (ca. 30 Ma) may coincide with a regionally documented lull in arc magmatic activity during which the Bahamas bank collided to the north. Paleomagnetic evidence of forearc sliver motion along the northeastern boundary of the Caribbean indicates a northward translation of the archipelago from a position above the Lesser Antilles subduction zone to its modern location along the highly oblique, strike-slip-dominated plate boundary, thus preventing the re-establishment of arc magmatism in the eastern Caribbean.

Abstract Image

追踪加勒比海岩浆演化:英属维尔京群岛作为大安的列斯弧和小安的列斯弧之间的过渡
英属维尔京群岛(BVI)位于大安的列斯群岛和小安的列斯群岛之间,是研究加勒比板块地球动力学演化的关键地点。研究样品的地球化学特征显示出典型的火山弧特征,包括钙碱性亲和、强负HFSE异常和LILE富集。δ Hf值均匀,表明地幔为morb型。岩浆来源于均匀的地幔楔,其中小于2%为板源沉积,主要为含水流体。在彼得和诺曼群岛发现了伴随的熔体成分。U-Pb测年强调活跃期约为13 Myr (43-30 Ma),年龄梯度由北东向西递减。测温数据显示,侵位深度从~ 6 km增加到13 km。与大安的列斯群岛和小安的列斯群岛相比,这个群岛在来源和年龄方面与已灭绝的北小安的列斯群岛弧有很强的相似性。提出了一个地球动力学演化模型,其中该群岛代表了大安的列斯弧和小安的列斯弧之间的过渡。渐新世岩浆活动的停止(约30 Ma)可能与区域记录的弧岩浆活动的平静相吻合,在此期间,巴哈马海岸向北碰撞。古地磁证据表明,沿加勒比海东北边界的弧前银条运动表明,该群岛从小安的列斯群岛俯冲带上方的位置向北平移至其沿高度倾斜、走滑为主的板块边界的现代位置,从而阻止了加勒比海东部弧岩浆活动的重新建立。
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来源期刊
Geochemistry Geophysics Geosystems
Geochemistry Geophysics Geosystems 地学-地球化学与地球物理
CiteScore
5.90
自引率
11.40%
发文量
252
审稿时长
1 months
期刊介绍: Geochemistry, Geophysics, Geosystems (G3) publishes research papers on Earth and planetary processes with a focus on understanding the Earth as a system. Observational, experimental, and theoretical investigations of the solid Earth, hydrosphere, atmosphere, biosphere, and solar system at all spatial and temporal scales are welcome. Articles should be of broad interest, and interdisciplinary approaches are encouraged. Areas of interest for this peer-reviewed journal include, but are not limited to: The physics and chemistry of the Earth, including its structure, composition, physical properties, dynamics, and evolution Principles and applications of geochemical proxies to studies of Earth history The physical properties, composition, and temporal evolution of the Earth''s major reservoirs and the coupling between them The dynamics of geochemical and biogeochemical cycles at all spatial and temporal scales Physical and cosmochemical constraints on the composition, origin, and evolution of the Earth and other terrestrial planets The chemistry and physics of solar system materials that are relevant to the formation, evolution, and current state of the Earth and the planets Advances in modeling, observation, and experimentation that are of widespread interest in the geosciences.
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