Rocas-Verdes盆地构造闭合期间的岩浆弧演化:来自富安地斯山脉纳瓦里诺岛(55°S)白垩纪最早古新世侵入岩的见解

IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of the Geological Society Pub Date : 2023-06-08 DOI:10.1144/jgs2022-163
R. Velásquez, J. Bastías, E. Salazar, F. Poblete, M. G. Guillot, D. Chew, M. Peña, Felipe Tapia, Adán Ramirez, Foteini Drakou
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引用次数: 0

摘要

纳瓦里诺岛位于安第斯山脉最南端,比格尔海峡以南。它的地质记录记录了火地岛复杂的构造历史,包括罗卡斯韦德斯盆地的开放和关闭,科迪勒拉弧碰撞和随后的俯冲过程。岛上的地质主要由白垩纪Yahgán组组成,这是一个海相元沉积序列,被各种各样的岩体侵入,这些岩体大多暴露在岛的西北端。在此,我们提出了一个新的数据集,显示了三个白垩纪-最早的古新世活跃边缘岩浆作用的岩浆套,它们位于Fuegian Andes早期,被称为(i) Dientes de Navarino微闪长岩基,一套形成于~ 101-97 Ma的构造前微闪长岩基;(ii) Castores深裂杂岩,一系列形成于~ 90-87 Ma的前-同构造辉长岩-重质岩体;(iii) Samantha二长岩,一套形成于~ 66-65 Ma的孤立二长-二黄道带后构造岩体。通过野外观测、地质填图、岩石学和全岩地球化学,结合角闪洞、黑云母40 Ar/ 39 Ar和U-Pb锆石LA-ICP-MS年代学,识别了这些不同的岩浆期。这些岩石的地球化学成分与形成于~ 101-65 Ma区间的大陆弧背景一致。当三个脉冲在纳瓦里诺岛空间上重叠时,弧岩浆活动在整个晚白垩纪表现出迁移(或扩张)。弧的轨迹随后在~ 68-66 Ma向西南方向移动。我们认为,这种在~ 68 ~ 66 Ma的向海沟迁移可能与俯冲角的变化有关。在纳瓦里诺岛记录的三个白垩纪-最早的古新世深冲脉冲形成于Fuegian Andes发育的早期阶段,是由弧后罗卡斯佛迪斯洋底碰撞和逆冲引起的一次主要挤压事件的前、同、后构造期。补充资料:https://doi.org/10.6084/m9.figshare.c.6675416
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Magmatic arc evolution during the tectonic closure of the Rocas Verdes basin: insights from Cretaceous-earliest Paleocene intrusive rocks of Navarino Island (55°S), Fuegian Andes
Navarino Island is located in the southernmost part of the Fuegian Andes, south of the Beagle Channel. It geological record documents the complex tectonic history of Tierra del Fuego that includes the opening and closure of the Rocas Verdes basin, Cordillera arc collision and subsequent subduction processes. The geology of the island is mostly comprised of the Cretaceous Yahgán Formation, a marine meta-sedimentary sequence, which is intruded by diverse plutons that are mostly exposed on the northwestern tip of the island. We herein present a new dataset that shows the presence of three Cretaceous-earliest Paleocene magmatic suites of active margin magmatism emplaced during the early stage of the Fuegian Andes, which are referred to as (i) the Dientes de Navarino Microdioritic Sills, a suite of pre-tectonic microdioritic sills that formed during ∼101-97 Ma; (ii) the Castores Plutonic Complex, a series of pre- to syn-tectonic gabbroic to tonalitic plutons emplaced during ∼90-87 Ma and (iii) the Samantha Monzonites, a suite of isolated monzonitic to monzodioritic post-tectonic plutons that formed at ∼66-65 Ma. These distinct magmatic episodes are recognised by field observations, geological mapping, petrography and whole-rock geochemistry integrated with amphibole and biotite 40 Ar/ 39 Ar and U-Pb zircon LA-ICP-MS geochronology. The geochemical compositions of these rocks are consistent with a continental arc setting that formed during the interval ∼101-65 Ma. While the three pulses spatially overlap in Navarino Island, the arc magmatism shows a migration (or expansion) throughout the Late Cretaceous. The locus of the arc then migrates at ∼68-66 Ma towards the southwest. We suggest that this trench-ward migration at ∼68-66 Ma may be associated with a change in the subduction angle. The three Cretaceous- earliest Paleocene plutonic pulses recorded in Navarino Island formed during the early stages of development of the Fuegian Andes, and are pre-, syn-and post-tectonic with respect to a major compressional event caused by the collision and obduction of the back-arc Rocas Verdes oceanic floor. Supplementary material: https://doi.org/10.6084/m9.figshare.c.6675416
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来源期刊
Journal of the Geological Society
Journal of the Geological Society 地学-地球科学综合
CiteScore
6.00
自引率
3.70%
发文量
68
审稿时长
6-12 weeks
期刊介绍: Journal of the Geological Society (JGS) is owned and published by the Geological Society of London. JGS publishes topical, high-quality recent research across the full range of Earth Sciences. Papers are interdisciplinary in nature and emphasize the development of an understanding of fundamental geological processes. Broad interest articles that refer to regional studies, but which extend beyond their geographical context are also welcomed. Each year JGS presents the ‘JGS Early Career Award'' for papers published in the journal, which rewards the writing of well-written, exciting papers from early career geologists. The journal publishes research and invited review articles, discussion papers and thematic sets.
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