The pseudo-Thellier palaeointensity method: new calibration and uncertainty estimates

doi:10.1093/gji/ggw349

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院地球与行星物理重点实验室

	The pseudo-Thellier palaeointensity method: new calibration and uncertainty estimates
	Paterson, Greig A.1; Heslop, David 2; Pan, Yongxin 1
刊名	GEOPHYSICAL JOURNAL INTERNATIONAL
	2016-12-01
卷号	207 期号:3 页码:1596-1608
关键词	Archaeomagnetism Palaeointensity
DOI	10.1093/gji/ggw349
文献子类	Article
英文摘要	Non-heating palaeointensity methods are a vital tool to explore magnetic field strength variations recorded by thermally sensitive materials of both terrestrial and extraterrestrial origin. One such method is the calibrated pseudo-Thellier method in which a specimen's natural remanent magnetization is alternating field demagnetized and replaced with a laboratory induced anhysteretic remanent magnetization (as an analogue of a thermoremanent magnetization, TRM). Using a set of 56 volcanic specimens given laboratory TRMs in fields of 10-130 mu T, we refine the calibration of the pseudo-Thellier method and better define the uncertainty associated with its palaeointensity estimates. Our new calibration, obtained from 32 selected specimens, resolves the issue of non-zero intercept, which is theoretically predicted, but not satisfied by any previous calibration. The range of individual specimen calibration factors, however, is relatively large, but consistent with the variability expected for SD magnetite. We explore a number of rock magnetic parameters in an attempt to identify selection thresholds for reducing the calibration scatter, but fail to find a suitable choice. We infer that our careful selection process, which incorporates more statistics then previous studies, may be largely screening out any strong rock magnetic dependence. Some subtle grain size or mineralogical dependencies, however, remain after selection, but cannot be discerned from the scatter expected for grain size variability of SD magnetite. As a consequence of the variability in the calibration factor, the uncertainty associated with pseudo-Thellier results is much larger than previously indicated. The scatter of the calibration is similar to 25 per cent of the mean value, which implies that, when combined with the scatter of results typically obtained from a single site, the uncertainty of averaged pseudo-Thellier results will always be > 25 per cent. As such, pseudo-Thellier results should be complementary to, and cross-validated with results from other methods. Nevertheless, the pseudo-Thellier method remains a valuable tool for obtaining palaeointensity estimates from thermally sensitive terrestrial and extraterrestrial materials and with careful data selection and analysis can yield results that are accurate to within a factor of 4 or better.
WOS关键词	ANHYSTERETIC REMANENT MAGNETIZATION ; GEOMAGNETIC-FIELD ; MAGNETITE ; ARM ; TRM ; SIZE
WOS研究方向	Geochemistry & Geophysics
语种	英语
WOS记录号	WOS:000388933300017
资助机构	NSFC(41374072 ; NSFC(41374072 ; NSFC(41374072 ; NSFC(41374072 ; Australian Research Council(DP160100805) ; Australian Research Council(DP160100805) ; Australian Research Council(DP160100805) ; Australian Research Council(DP160100805) ; CAS(XDB18010203) ; CAS(XDB18010203) ; CAS(XDB18010203) ; CAS(XDB18010203) ; 41574063) ; 41574063) ; 41574063) ; 41574063) ; NSFC(41374072 ; NSFC(41374072 ; NSFC(41374072 ; NSFC(41374072 ; Australian Research Council(DP160100805) ; Australian Research Council(DP160100805) ; Australian Research Council(DP160100805) ; Australian Research Council(DP160100805) ; CAS(XDB18010203) ; CAS(XDB18010203) ; CAS(XDB18010203) ; CAS(XDB18010203) ; 41574063) ; 41574063) ; 41574063) ; 41574063)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/53190]
专题	地质与地球物理研究所_中国科学院地球与行星物理重点实验室
作者单位	1.Chinese Acad Sci, Key Lab Earth & Planetary Phys, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Australian Natl Univ, Res Sch Earth Sci, Bldg 142,Mills Rd, Acton, ACT 2601, Australia
推荐引用方式 GB/T 7714	Paterson, Greig A.,Heslop, David,Pan, Yongxin. The pseudo-Thellier palaeointensity method: new calibration and uncertainty estimates[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2016,207(3):1596-1608.
APA	Paterson, Greig A.,Heslop, David,&Pan, Yongxin.(2016).The pseudo-Thellier palaeointensity method: new calibration and uncertainty estimates.GEOPHYSICAL JOURNAL INTERNATIONAL,207(3),1596-1608.
MLA	Paterson, Greig A.,et al."The pseudo-Thellier palaeointensity method: new calibration and uncertainty estimates".GEOPHYSICAL JOURNAL INTERNATIONAL 207.3(2016):1596-1608.