Geology, tectonism and composition of the northwest Imbrium region

doi:10.1016/j.icarus.2017.12.029

	Geology, tectonism and composition of the northwest Imbrium region
	Wu, Yunzhao 1,2; Li, Lin3 ; Luo, Xiaoxing 4; Lu, Yu 5,6; Chen, Yuan 5; Pieters, Cade M.7; Basilevsky, Alexander T.8; Head, James W.7
刊名	ICARUS
	2018-03-15
卷号	303 页码:67-90
关键词	Imbrium Late stage lunar basalts Young ridges Chang'E-3 Geologic mapping
ISSN号	0019-1035
DOI	10.1016/j.icarus.2017.12.029
通讯作者	Wu, Yunzhao(wu@pmo.ac.cn)
英文摘要	The objective of this study is to explore the regional geology of the northwest Imbrium region in which the Chang'E-3 (CE-3) landing site is located. CE-3 successfully landed on December 14, 2013 on the un-sampled Eratosthenian basalts whose study is important for understanding the evolution of the Moon. New geologic and structural maps of the research area were produced through the integrated analysis of diverse datasets. The highlands surrounding Imbrium differ from typical Farside Highlands Terrain (FHT). The Iridum highland region (as well as the surrounding Imbrium region) exhibits elevated concentrations of Fe, and abundant local exposures of low-Ca pyroxene and olivine bearing lithologies. In this study these highlands are named as mafic highlands (MH). Our dating results using crater size-frequency distributions (CSFDs) show that the Iridum basin (hosting Sinus Iridum) was formed-3.8 Ga, shortly following the Imbrium basin formation and before the last large multiringed basin, Orientale. The Eratosthenian period of lunar basalt eruptions, which lasted longer than other stratigraphic units, is suggested to divide into the Lower Eratosthenian mare (LEm) and Upper Eratosthenian mare (UEm) units. This subdivision is based on whether lava fronts can be clearly seen or not and the age separating the units is 2.35 Ga. The mafic mineralogy of the mare basalts in Imbrium is characterized by abundant olivine in the Eratosthenian-aged basalts and average pyroxene compositions near pigeonite to sub-calcic augite in the Imbrian and Em1 units. The thickness of individual lava for UEm units is 8-11 m, indicative of high effusion rates. The thickness of the Em3 unit ranges from similar to 17 m to similar to 45 m with lesser thickness to the west and greater thickness in the interior and to the east. The estimated volume and average flux of the Eratosthenian-aged basalts are greater than previously thought. The presence of these youngest basalts in the Procellarum-KREEP terrain (PKT) is hypothesized to be a causal relationship, with the PKT terrain reducing the thickness of the lithosphere and permitting preferential dike emplacement and extrusion there. We speculate that high-Ti and olivine-rich composition in late stage basalts may be consistent with low Si and high Ti and low degrees of partial melting. Large numbers of sinuous rilles and small ridges are identified and mapped. Many young ridges were found inside Imbrium, suggesting a very extended period (at least as young as the last 50 Ma) of the Moon's tectonic activity. The distinct compositions of both highlands and mare basalts and extended tectonism emphasize how the Imbrium basin is an important area for understanding the Moon. (C) 2017 Elsevier Inc. All rights reserved.
WOS关键词	MINERALOGY MAPPER M-3 ; SPECTROMETER IIM DATA ; LUNAR MARE BASALTS ; INNER SOLAR-SYSTEM ; EARTH-BASED RADAR ; PHOTOMETRIC CORRECTION ; GRUITHUISEN REGION ; MULTISOURCE DATA ; WRINKLE RIDGES ; SINUS IRIDUM
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	ACADEMIC PRESS INC ELSEVIER SCIENCE
WOS记录号	WOS:000424534300007
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/22325]
专题	中国科学院紫金山天文台
通讯作者	Wu, Yunzhao
作者单位	1.Chinese Accidemy Sci, Key Lab Planetary Sci, Purple Mt Observ, Nanjing 210034, Jiangsu, Peoples R China 2.Macau Univ Sci & Technol, Space Sci Inst, Macau, Peoples R China 3.Indiana Univ Purdue Univ, Dept Earth Sci, 723 W Michigan St, Indianapolis, IN 96202 USA 4.East China Mineral Explorat & Dev Bur, Nanjing 210007, Jiangsu, Peoples R China 5.Nanjing Univ, Sch Geog & Oceanog Sci, Nanjing 210023, Jiangsu, Peoples R China 6.Jiangsu Ctr Collaborat Innovat Geog Informat Reso, Nanjing 210023, Jiangsu, Peoples R China 7.Brown Univ, Dept Earth Environm & Planetary Sci, Providence, RI 02912 USA 8.Russian Acad Sci, Vernadsky Inst Geochem & Analyt Chem, Moscow, Russia
推荐引用方式 GB/T 7714	Wu, Yunzhao,Li, Lin,Luo, Xiaoxing,et al. Geology, tectonism and composition of the northwest Imbrium region[J]. ICARUS,2018,303:67-90.
APA	Wu, Yunzhao.,Li, Lin.,Luo, Xiaoxing.,Lu, Yu.,Chen, Yuan.,...&Head, James W..(2018).Geology, tectonism and composition of the northwest Imbrium region.ICARUS,303,67-90.
MLA	Wu, Yunzhao,et al."Geology, tectonism and composition of the northwest Imbrium region".ICARUS 303(2018):67-90.