GSTDTAP  > 地球科学
DOI10.1130/B31569.1
A 40,000 yr record of clay mineralogy at Lake Towuti, Indonesia: Paleoclimate reconstruction from reflectance spectroscopy and perspectives on paleolakes on Mars
Goudge, Timothy A.1,2; Russell, James M.1; Mustard, John F.1; Head, James W.1; Bijaksana, Satria3
2017-07-01
发表期刊GEOLOGICAL SOCIETY OF AMERICA BULLETIN
ISSN0016-7606
EISSN1943-2674
出版年2017
卷号129
文章类型Article
语种英语
国家USA; Indonesia
英文摘要

Sediment deposited within lake basins can preserve detailed records of past environmental conditions on planetary surfaces, including both Earth and Mars. Establishing how to best characterize these paleoclimate records is thus critical for understanding the evolution of past planetary climates. Here, we present an similar to 40 k.y. lake sediment record from Lake Towuti, Indonesia, developed using visible to near-infrared (VNIR) reflectance spectroscopy. Source sediment from the main river input to Lake Towuti, the Mahalona River, is spectrally dominated by Mg-rich serpentine; however, we also identify a distinct Al-phyllosilicate component, which we interpret as kaolinite, that increases in relative proportion to serpentine with decreasing grain size. Sink sediment from two cores collected at the distal margins of the Mahalona River delta has similar spectral signatures to the input source sediment. The cores capture systematic variations in the proportion of Alphyllosilicate to serpentine over time, which is also expressed in changes in bulk elemental chemistry of the sediment. We show that the abundance of serpentine relative to Al-phyllosilicate increases dramatically during the globally cooler, regionally drier climate of the Last Glacial Maximum. This change records the grain size-dependent mineralogy of deltaic sediment, which is ultimately driven by forced delta progradation and river incision during lake lowstands. Our analyses show that VNIR reflectance spectroscopy offers a rapid, nondestructive, and effective method for developing paleoenvironmental records from sedimentary phyllosilicate mineralogy. Exposed paleolake deposits on Mars should preserve similar paleoenvironmental information that can be accessed through detailed remote sensing observations of stratigraphy and VNIR reflectance spectroscopy in a source-to-sink framework.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000405373200003
WOS关键词EAST SULAWESI OPHIOLITE ; AQUEOUS SEDIMENTATION ; INFRARED-SPECTROSCOPY ; QUANTITATIVE-ANALYSIS ; WEATHERING PROFILES ; MERIDIANI-PLANUM ; SALINE LAKE ; CLIMATE ; CRATER ; HISTORY
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/24824
专题地球科学
作者单位1.Brown Univ, Dept Earth Environm & Planetary Sci, 324 Brook St,Box 1846, Providence, RI 02912 USA;
2.Univ Texas Austin, Jackson Sch Geosci, Austin, TX 78712 USA;
3.Inst Teknol Bandung, Fac Min & Petr Engn, Jalan Ganesa 10, Bandung 40132, Indonesia
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Goudge, Timothy A.,Russell, James M.,Mustard, John F.,et al. A 40,000 yr record of clay mineralogy at Lake Towuti, Indonesia: Paleoclimate reconstruction from reflectance spectroscopy and perspectives on paleolakes on Mars[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2017,129.
APA Goudge, Timothy A.,Russell, James M.,Mustard, John F.,Head, James W.,&Bijaksana, Satria.(2017).A 40,000 yr record of clay mineralogy at Lake Towuti, Indonesia: Paleoclimate reconstruction from reflectance spectroscopy and perspectives on paleolakes on Mars.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,129.
MLA Goudge, Timothy A.,et al."A 40,000 yr record of clay mineralogy at Lake Towuti, Indonesia: Paleoclimate reconstruction from reflectance spectroscopy and perspectives on paleolakes on Mars".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 129(2017).
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