IGGCAS OpenIR  > 地球与行星物理院重点实验室
Approach to trace hidden paleo-weathering of basaltic crust through decoupled Mg-Sr and Nd isotopes recorded in volcanic rocks
Tian, Heng-Ci1,2; Yang, Wei1,2; Li, Shu-Guang3; Wei, Hai-Quan4; Yao, Zhuo-Sen5; Ke, Shan3
2019-03-30
Source PublicationCHEMICAL GEOLOGY
ISSN0009-2541
Volume509Pages:234-248
AbstractOn Earth, chemical weathering of basaltic rocks not only modulates the climate change, but also plays a crucial role on the ocean oxygenation and ecosystem evolution. Records of paleo-weathered crusts are a challenge to identify because they are obscured by subsequent alteration processes and buried by the newly formed volcanic lavas. However, late formed volcanic rocks theoretically could record previously weathered crust via their assimilation and fractional crystallization (AFC) processes. Here, we present a systematic study on major, trace elements and Sr-Nd-Mg isotopes in a suite of Changbaishan early formed basalts and late erupted trachytes from Northeast China. Detailed evidence of field observation, geochemical signature and rhyolite-MELTS simulations suggest that trachytes mainly originated from deep fractional crystallization of basaltic melts. The low abundant trachytes from the stratigraphic layer above the basalts display decoupled Mg-Sr and Nd isotopes. delta Mg-26 and Sr-87/Sr-86 in trachytes range from - 0.27 up to + 0.94 parts per thousand (the heaviest isotopic composition ever reported for Mg in the igneous rocks) and 0.70490 to 0.71065, respectively, which are significantly elevated relative to that of their mantle source. However, they preserved mantle source-like Nd-143/Nd-144 (0.512584 to 0.512656) ratios. These unusual characteristics cannot be explained by thermal diffusion, fractional crystallization or simple crustal contamination processes. Specifically, delta Mg-26 correlates positively with SiO2 and Sr-87/Sr-86, and negatively with MgO, CaO, Al2O3, Sr and Nb/U indicators. The highly elevated Mg and Sr isotopes but limited Nd isotopic changes in trachytes require a component to be the relatively younger weathering residue of basaltic rocks. Taking this component as a wall rock endmember, the well-developed above correlations can be best modelled by AFC processes. This reflects that some trachytes in the aftermath of AFC processes almost fully lost their primary source characteristics, but inherited the intense chemical weathering signature of basalts. This event probably occurred in the middle Miocene as studies of paleosols showed humid and warm climate during that period after the initial eruption of Changbaishan basalts. Therefore, our study as a specific case for the first time provides an efficient way to explore paleo-weathering of basaltic crusts buried in the Earths surface, through comprehensive investigating Mg, Sr and Nd isotopes of volcanic rocks developed in the late stage of a volcano cone.
KeywordHidden paleo-weathering of crust Sr-Nd-Mg isotopes AFC processes Chemical weathering Changbaishan volcanic rocks
DOI10.1016/j.chemgeo.2019.01.019
Funding OrganizationStrategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Postdoctoral Program ; National Postdoctoral Program ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Postdoctoral Program ; National Postdoctoral Program ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Postdoctoral Program ; National Postdoctoral Program ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Postdoctoral Program ; National Postdoctoral Program ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents
WOS KeywordCHANGBAISHAN-TIANCHI VOLCANO ; ATMOSPHERIC CARBON-DIOXIDE ; CHINA/NORTH KOREA ; MAGMA EVOLUTION ; BAEKDUSAN CHANGBAISHAN ; RIVER GEOCHEMISTRY ; MANTLE XENOLITHS ; NORTHEAST CHINA ; TIBETAN PLATEAU ; GLOBAL CLIMATE
Language英语
Funding ProjectStrategic Priority Research Program of the Chinese Academy of Sciences[XDB18000000] ; National Natural Science Foundation of China[41730214] ; National Postdoctoral Program[2018M631566] ; National Postdoctoral Program for Innovative Talents[BX201700237]
Funding OrganizationStrategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Postdoctoral Program ; National Postdoctoral Program ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Postdoctoral Program ; National Postdoctoral Program ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Postdoctoral Program ; National Postdoctoral Program ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Postdoctoral Program ; National Postdoctoral Program ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000459780600016
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/90701
Collection地球与行星物理院重点实验室
Corresponding AuthorTian, Heng-Ci; Li, Shu-Guang
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
3.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China
4.China Earthquake Adm, Inst Geol, Beijing 100029, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
Recommended Citation
GB/T 7714
Tian, Heng-Ci,Yang, Wei,Li, Shu-Guang,et al. Approach to trace hidden paleo-weathering of basaltic crust through decoupled Mg-Sr and Nd isotopes recorded in volcanic rocks[J]. CHEMICAL GEOLOGY,2019,509:234-248.
APA Tian, Heng-Ci,Yang, Wei,Li, Shu-Guang,Wei, Hai-Quan,Yao, Zhuo-Sen,&Ke, Shan.(2019).Approach to trace hidden paleo-weathering of basaltic crust through decoupled Mg-Sr and Nd isotopes recorded in volcanic rocks.CHEMICAL GEOLOGY,509,234-248.
MLA Tian, Heng-Ci,et al."Approach to trace hidden paleo-weathering of basaltic crust through decoupled Mg-Sr and Nd isotopes recorded in volcanic rocks".CHEMICAL GEOLOGY 509(2019):234-248.
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