Remote laser-induced breakdown spectroscopy analysis of East African Rift sedimentary samples under Mars conditions

被引：29

作者：

Dyar, M. D. ^{[1
]}

Carmosino, M. L. ^{[2
]}

Tucker, J. M. ^{[1
]}

Brown, E. A. ^{[1
]}

Clegg, S. M. ^{[3
]}

Wiens, R. C. ^{[3
]}

Barefield, J. E. ^{[3
]}

Delaney, J. S. ^{[4
]}

Ashley, G. M. ^{[4
]}

Driese, S. G. ^{[5
]}

机构：

[1] Mt Holyoke Coll, Dept Astron, S Hadley, MA 01075 USA

[2] Hampshire Coll, Dept Comp Sci, Amherst, MA 01002 USA

[3] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[4] Rutgers State Univ, Dept Earth & Planetary Sci, Piscataway, NJ 08854 USA

[5] Baylor Univ, Dept Geol, Waco, TX 76798 USA

来源：

CHEMICAL GEOLOGY | 2012年 / 294卷

关键词：

LIBS; Quantitative analysis; Elemental analysis; Bulk analysis; Mars; East African Rift; MERIDIANI-PLANUM; RAPID ANALYSIS; OLDUVAI GORGE; MINERALS; DISCRIMINATION; CHEMOMETRICS; PROVENANCE; REGRESSION; TANZANIA; STRATIGRAPHY;

D O I：

10.1016/j.chemgeo.2011.11.019

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Laser-induced breakdown spectroscopy will be used by the ChemCam instrument on the Curiosity rover to obtain chemical analyses of the martian surface. Surficial and deeper hydrothermal processes on Mars have produced a diverse family of chemical and clastic sedimentary lithologies from primary igneous rocks through physical and chemical transport, deposition, and diagenesis. This study uses 16 samples from the East African Rift (EAR) as martian analogues to assess use of LIBS to evaluate weathering reactions in sedimentary rocks. Data were acquired at 9 m distance with samples under conditions designed to simulate Mars. Use of external validation, in which a few sedimentary samples are added to the validation set, coupled with choice of the first local minimum in the root mean square value in all the components of the validation model, provides optimal results in this data set. Accuracy is measured using root mean square error predictions for major elements in the sedimentary rocks, as expressed in wt.% oxides. Even lower errors can be obtained by using a more focused training set. These results are sufficiently accurate to usefully characterize the four competing kinds of chemical weathering reactions in paleosols (hydrolysis, oxidation, hydration, and salinization). (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：135 / 151

页数：17

共 67 条

[1] Laser-induced breakdown spectroscopy-based geochemical fingerprinting for the rapid analysis and discrimination of minerals: the example of garnet [J].