气候变化领域集成服务门户(CCPortal): Syn-tectonic Dipilto batholith (NW Nicaragua) linked to arc-continent collision: High- and room-temperature AMS evidence

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DOI	10.1016/j.tecto.2021.229000
	Syn-tectonic Dipilto batholith (NW Nicaragua) linked to arc-continent collision: High- and room-temperature AMS evidence
	García-Amador B.I.; Alva-Valdivia L.M.; Hernández-Cardona A.
发表日期	2021
ISSN	00401951
卷号	815
英文摘要	The northern Central America region (Honduras and Nicaragua) is characterized by geotectonic units delimited by strike-slip fault systems and shortening zones of poorly constrained ages. The eastern portion of the Chortís block, named the “Dipilto micro-block” or “Patuca” is one of these units that besides with the Siuna Serpentinite Mélange, provides evidence for Early Cretaceous arc-continent collision. Nevertheless, within the Dipilto micro-block is the Early Cretaceous Dipilto batholith (NW Nicaragua), an Ilmenite-Series granitoid suites whose emplacement tectonic setting is unknown. We document the room- and high-temperature anisotropy of magnetic susceptibility (RT-AMS and HT-AMS) and hysteresis cycles from 31 sites in the Dipilto batholith and cross-cutting dikes as well as the oxide mineral microscopy of main lithologies. This is to investigate the magmatic fabric in the granitoids and dikes, and the relation to the emplacement dynamics. The RT-AMS and HT-AMS results show magnetic lineation and foliation (Kmax and Kmax–Kint plane) dominated by paramagnetic minerals (biotite and hornblende). The central parts of the intrusion show a NE-SW Kmax distribution and sites near to boundary of the country-rock a Kmax–Kint plane sub-parallel to the contact. These results and previous structural data in the surrounding Nueva Segovia Schist country-rock support an intrusion emplaced in a contractional setting concurrent with the batholith's NE-SW regional geometry. The Dipilto batholith age (119–112 Ma) implies a syn-collisional origin that together with our results indicate an Early Cretaceous progressive shortening in the region associated with the Siuna Intraoceanic Arc collision (~134–113 Ma). Furthermore, they indicate that the shortening azimuth (i.e., the direction of tectonic transport) is ~127°–137° in its current geographical position, but was 227°–237° in its Early Cretaceous paleo-position, probably related to the final stage of shortening and collision events of the southwestern Mexican paleocontinent. © 2021 Elsevier B.V.
关键词	Chortís block Dipilto micro-block High-temperature AMS Ilmenite-Series Siuna Intraoceanic Arc Syn-collisional batholith
英文关键词	Levees; Magnesite; Magnetic anisotropy; Magnetic susceptibility; Mica; Oxide minerals; Rare earths; Strike-slip faults; Arc-continent collision; Geographical positions; Hysteresis cycles; Intra-oceanic arc; Magnetic lineations; Room and high temperatures; Strike-slip fault systems; Tectonic transport; Structural geology
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207975
作者单位	Posgrado en Ciencias de la Tierra, Instituto de Geofísica, Universidad Nacional Autónoma de México, Ciudad de México, Mexico; Laboratorio de Paleomagnetismo, Instituto de Geofísica, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
推荐引用方式 GB/T 7714	García-Amador B.I.,Alva-Valdivia L.M.,Hernández-Cardona A.. Syn-tectonic Dipilto batholith (NW Nicaragua) linked to arc-continent collision: High- and room-temperature AMS evidence[J],2021,815.
APA	García-Amador B.I.,Alva-Valdivia L.M.,&Hernández-Cardona A..(2021).Syn-tectonic Dipilto batholith (NW Nicaragua) linked to arc-continent collision: High- and room-temperature AMS evidence.Tectonophysics,815.
MLA	García-Amador B.I.,et al."Syn-tectonic Dipilto batholith (NW Nicaragua) linked to arc-continent collision: High- and room-temperature AMS evidence".Tectonophysics 815(2021).