Gravity Anomalies and Implications for Shallow Mantle Processes of the Western Cocos-Nazca Spreading Center

Zheng, Tingting1,2; Lin, Jian1,3; Schouten, Hans4; Smith, Deborah K.4; Klein, Emily5; Parnell-Turner, Ross6

2023-03-16

10.1029/2022GL102133

GEOPHYSICAL RESEARCH LETTERS   Impact Factor & Quartile

0094-8276

1944-8007

This study analyzes up-to-date gravity data in the Galapagos triple junction region to understand crustal structure and melt distribution beneath the propagating Cocos-Nazca spreading center (CNSC). Application of a standard thermal model to the mantle Bouguer gravity anomaly (MBA) does not appear to result in a realistic crustal thickness in this region. The cross-CNSC MBA profiles flatten and axial values increase from east toward the western end of the CNSC. A simple smoothing filter applied to the standard thermal model with different filter widths can explain the progressive flattening of the MBA and is interpreted as different distribution widths (concentrations) of partial melt in the mantle. The east-west residual MBA gradient along the CNSC is similar to the east flank of the East Pacific Rise (EPR), suggesting that the along-CNSC gradient could partly reflect the shallow mantle properties associated with the EPR.

Galapagos triple junction Cocos-Nazca spreading center mantle Bouguer gravity anomalies crustal thickness possible melt distribution

SCI

English

Corresponding

National Science Foundation of China["42006055","41890813","92258303"] ; Chinese Academy of Sciences["Y4SL021001","133244KYSB20180029","ISEE2021PY03","131551KYSB20200021"] ; Shenzhen Science and Technology Innovation Commission[KCXFZ20211020174803005] ; National Science Foundation["OCE-1558592","JCYJ20220818100417038"] ; null[OCE-1558342]

Geology

Geosciences, Multidisciplinary

WOS:000947190100010

AMER GEOPHYSICAL UNION

GEOSCIENCES

Web of Science

1.Chinese Acad Sci, South China Sea Inst Oceanol, Innovat Acad South China Sea Ecol & Environm Engn, China Key Lab Ocean & Marginal Sea Geol, Guangzhou, Peoples R China
2.China Pakistan Joint Res Ctr Earth Sci, CAS HEC, Islamabad, Pakistan
3.Southern Univ Sci & Technol, Dept Ocean Sci & Engn, Shenzhen, Peoples R China
4.Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA USA
5.Duke Univ, Durham, NC USA
6.Univ Calif La Jolla, Scripps Inst Oceanog, La Jolla, CA USA

Zheng, Tingting,Lin, Jian,Schouten, Hans,et al. Gravity Anomalies and Implications for Shallow Mantle Processes of the Western Cocos-Nazca Spreading Center[J]. GEOPHYSICAL RESEARCH LETTERS,2023,50(5).

Zheng, Tingting,Lin, Jian,Schouten, Hans,Smith, Deborah K.,Klein, Emily,&Parnell-Turner, Ross.(2023).Gravity Anomalies and Implications for Shallow Mantle Processes of the Western Cocos-Nazca Spreading Center.GEOPHYSICAL RESEARCH LETTERS,50(5).

Zheng, Tingting,et al."Gravity Anomalies and Implications for Shallow Mantle Processes of the Western Cocos-Nazca Spreading Center".GEOPHYSICAL RESEARCH LETTERS 50.5(2023).