globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2021.228856
论文题名:
The thermo-tectonic evolution of the actively exhuming Mai'iu Fault footwall – Suckling-Dayman metamorphic core complex – in the Woodlark Rift of Papua New Guinea
作者: Österle J.E.; Seward D.; Stockli D.F.; Little T.A.; Rooney J.S.; Gordon S.M.; Smith E.; Gordon K.C.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 811
语种: 英语
中文关键词: Low-angle normal fault ; Low-temperature thermochronology ; Metamorphic core complex ; Original dip ; Rolling hinge model ; Slip rate
英文关键词: Aluminum metallography ; Fission reactions ; Mica ; Phosphate minerals ; Thermal gradients ; Zircon ; Zircon deposits ; Apatite fission tracks ; Carbonaceous materials ; Geothermal gradients ; Metamorphic core complex ; Tectonic evolution ; Tectonic exhumation ; Temperature and pressures ; Thermochronometry ; Faulting ; alluvial deposit ; apatite ; dome ; exhumation ; fault zone ; footwall ; normal fault ; slip rate ; tectonic evolution ; thermochronology ; Coral Sea ; Pacific Ocean ; Papua New Guinea ; Solomon Sea ; Woodlark Rift
英文摘要: The Mai'iu Fault in the Woodlark Rift of southeastern Papua New Guinea is an active north-dipping low-angle normal fault (LANF) that has exhumed the spectacular Suckling-Dayman metamorphic core complex (SDMCC) in its footwall. While its youthful domal geomorphology suggests recent tectonic exhumation of the SDMCC, the cooling and exhumation history of this active metamorphic core complex have not been studied in detail before. Here we provide the first zircon and apatite fission-track (FT) and (U-Th)/He thermochronometric data on the SDMCC based on a suite of samples from slip-parallel footwall transects and syn-extensional alluvial deposits shed from the emerging dome. In addition, we double dated zircon using U–Pb LA-ICP-MS. These chronometric techniques are complemented by temperature and pressure estimates from Raman spectroscopy of carbonaceous material (RSCM) and Al-in-amphibole and Al-in-biotite barometry on footwall phyllites/schists and granitoids, respectively. The data indicate that slip on the Mai'iu Fault had initiated by ~4 Ma. We show that slip on the Mai'iu Fault has persisted at cm/year rates since the onset of extension, making it one of Earth's most rapidly slipping continental LANF. Integrating temperature estimates from FT and (U-Th)/He thermochronometry and RSCM, we calculated a down-dip, fault-parallel paleo-field temperature gradient along the now-exhumed part of the Mai'iu Fault of ~11 °C/km. For a likely range of pre-extensional geothermal gradients in the Woodlark Rift (10–20 °C/km), this paleo-field temperature gradient implies an average initial dip of the Mai'iu Fault of ~46°. Given the present dip of ~21° at the surface, the thermal data reinforce other evidence that the footwall of the Mai'iu Fault has been back-rotated to the south by ≥20° during progressive unroofing since fault inception, consistent with a rolling hinge style evolution of the SDMCC. © 2021 Elsevier B.V.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170877
Appears in Collections:气候变化与战略

Files in This Item:

There are no files associated with this item.


作者单位: School of Geography, Environment and Earth Sciences, Victoria University of Wellington, PO Box 600, Wellington, New Zealand; Department of Geological Sciences, The University of Texas at Austin, 2275 Speedway Stop C900, Austin, TX 78712-17221, United States; Department of Chemistry, University of Otago, Union Place West, Dunedin, 9016, New Zealand; Department of Geological Sciences, University of Nevada, Reno, NV 89557, United States

Recommended Citation:
Österle J.E.,Seward D.,Stockli D.F.,et al. The thermo-tectonic evolution of the actively exhuming Mai'iu Fault footwall – Suckling-Dayman metamorphic core complex – in the Woodlark Rift of Papua New Guinea[J]. Tectonophysics,2021-01-01,811
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Österle J.E.]'s Articles
[Seward D.]'s Articles
[Stockli D.F.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Österle J.E.]'s Articles
[Seward D.]'s Articles
[Stockli D.F.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Österle J.E.]‘s Articles
[Seward D.]‘s Articles
[Stockli D.F.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.