气候变化领域集成服务门户(CCPortal): Assessment and Integration of Bulk and Component-Specific Methods for Identifying Mineral Magnetic Assemblages in Environmental Magnetism

CCPortal

DOI	10.1029/2019JB019024
	Assessment and Integration of Bulk and Component-Specific Methods for Identifying Mineral Magnetic Assemblages in Environmental Magnetism
	Qian Y.; Roberts A.P.; Liu Y.; Hu P.; Zhao X.; Heslop D.; Grant K.M.; Rohling E.J.; Hennekam R.; Li J.
发表日期	2020
ISSN	21699313
卷号	125 期号:8
英文摘要	Magnetic parameters are used extensively to interpret magnetic mineral assemblage variations in environmental studies. Conventional room temperature measurements of bulk magnetic parameters, like the anhysteretic remanent magnetization (ARM) and the ratio of the susceptibility of ARM to magnetic susceptibility (χ), can reflect, respectively, magnetic mineral concentration and/or particle size variations in sediments, although they are not necessarily well suited for identifying magnetic components within individual magnetic mineral assemblages. More advanced techniques, such as first-order reversal curve (FORC) diagrams and low-temperature (LT) magnetic measurements, can enable detailed discrimination of magnetic assemblages. Here, we integrate conventional bulk magnetic measurements alongside FORC diagrams, LT measurements, and X-ray fluorescence core-scan data, transmission electron microscope observations, and principal component analysis of FORC diagrams to identify and quantify magnetic mineral assemblages in eastern Mediterranean sediments. The studied sediments were selected because they contain complexly varying mixtures of detrital, biogenic, and diagenetically altered magnetic mineral assemblages that were deposited under varying oxic (organic-poor marls) to anoxic (organic-rich sapropels) conditions. Conventional bulk magnetic parameters provide continuous records of environmental magnetic variations, while more time-consuming LT and FORC measurements on selected samples provide direct ground-truthing of mineral magnetic assemblages that enables calculation of magnetization contributions of different end members. Thus, a combination of conventional bulk parameters and advanced magnetic techniques can provide detailed records from which the meaning of environmental magnetic signals can be unlocked. ©2020. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187713
作者单位	Research School of Earth Sciences, Australian National University, Canberra, ACT, Australia; Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; Ocean and Earth Science, University of Southampton, National Oceanography Centre, Southampton, United Kingdom; Department of Ocean Systems, NIOZ Royal Netherlands Institute for Sea Research and Utrecht University, Utrecht, Netherlands
推荐引用方式 GB/T 7714	Qian Y.,Roberts A.P.,Liu Y.,et al. Assessment and Integration of Bulk and Component-Specific Methods for Identifying Mineral Magnetic Assemblages in Environmental Magnetism[J],2020,125(8).
APA	Qian Y..,Roberts A.P..,Liu Y..,Hu P..,Zhao X..,...&Li J..(2020).Assessment and Integration of Bulk and Component-Specific Methods for Identifying Mineral Magnetic Assemblages in Environmental Magnetism.Journal of Geophysical Research: Solid Earth,125(8).
MLA	Qian Y.,et al."Assessment and Integration of Bulk and Component-Specific Methods for Identifying Mineral Magnetic Assemblages in Environmental Magnetism".Journal of Geophysical Research: Solid Earth 125.8(2020).