Constancy of Nb/U in the mantle revisited

Sun, Weidong; Hu, Yanhua; Kamenetsky, Vadim S.; Eggins, Stephen; Chen, Ming; Arculus, R. J.

doi:10.1016/j.gca.2008.04.029

Cited by 95 publications

(48 citation statements)

References 59 publications

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“…that of the lower continental crust (Sun and McDonough 1989;Rudnick and Gao 2003;Sun et al 2008). All adakites from the circum-Pacific margins (GEOROC 2010), which are predominantly partial melts of subducted slab (Kay 1978;Defant and Drummond 1990;Drummond et al 1996), fall together in a vertically distributed low-La/Yb field, consistent with the light REE-depleted characteristics of mid-ocean ridge basalt (MORB).…”

Section: Slab Melting Versus Lower Continental Crust Meltingmentioning

confidence: 86%

Destruction of the North China Craton Induced by Ridge Subductions

Ling

Li²,

Ding

et al. 2013

The Journal of Geology

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A B S T R A C TThe destruction of the North China Craton (NCC) mainly occurred in the Cretaceous and has been attributed to a "top-down" rapid delamination, "bottom-up" long-term thermal/chemical erosions, or hydration by subductionreleased fluids. On the basis of the distribution of one Jurassic and two Early Cretaceous adakite belts and the drifting history of the paleo-Pacific Plate, we propose that three ridge subduction events dominated the large-scale decratonization in the NCC. Both physical erosion and magmatism induced by ridge subduction contributed to the destruction of the NCC; the last ridge subduction, at Ma, was the key driving force in the final destruction. We present 130 ‫ע‬ 5 mineralogical, geochemical, and isotopic data in support of the ridge subduction model: flat subduction of a spreading ridge resulted in stronger physical erosion on the thick lithosphere mantle of the NCC. Consequently, slab melting occurred during ridge subduction, forming adakites with mantle Mg isotope compositions, followed by A-type granites as a result of asthenosphere upwelling. Delaminated lower continental crust was also partially melted after reacting with hydrous magmas, as indicated by eclogite xenoliths, resulting in a zircon age spectrum similar to that of the NCC and some adakitic samples with chemical characteristics similar to those of the Dabie adakites. The final decratonization was triggered by the last ridge subduction, with both physical erosion (flat subduction) and thermal erosion (adakitic and A-type magmatisms). Given that ridge subduction has occurred throughout Earth's history, the associated decratonization processes are presumably a common phenomenon that modified the chemical compositions of the continental crust.

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Section: Slab Melting Versus Lower Continental Crust Meltingmentioning

confidence: 86%

Destruction of the North China Craton Induced by Ridge Subductions

Ling

Li²,

Ding

et al. 2013

The Journal of Geology

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“…16). Both Ce/Pb and Nb/U rations are considerably lower than those of the mantle and MORB (Hofmann, 1997;Sun et al, 2008Sun et al, , 2012, but are similar to those of the continental crust (Rudnick and Gao, 2003). The Ce/Pb ratios of syenite are even lower than average continental crust (Rudnick and Gao, 2003).…”

Section: Origin Of the Haiyang A-type Granite Complexmentioning

confidence: 86%

“…The Ce/Pb ratios of syenite are even lower than average continental crust (Rudnick and Gao, 2003). Given that Pb and U are more mobile than Ce and Nb, respectively, during plate subduction (McCulloch and Gamble, 1991;Pearce and Peate, 1995;Sun et al, 2008), the lower Ce/Pb ratios of syenite seemingly indicate a greater influence from subduction released fluids than K-feldspar granite (Fig. 16).…”

Section: Origin Of the Haiyang A-type Granite Complexmentioning

confidence: 98%

The geochemical characteristics of Haiyang A-type granite complex in Shandong, eastern China

He¹,

Ling²,

Ding³

et al. 2014

Lithos

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“…The temporal, geochemical, and geographic shifts observed in the Sonya Creek volcanic (Sun et al, 2008), lower and middle continental crust (LCC, MCC; Rudnick and Gao, 2003). Nikolai Greenstone data are from Greene et al (2008Greene et al ( , 2009.…”

Section: Final Thoughtmentioning

confidence: 99%

Initiation of the Wrangell Arc: A Record of Tectonic Changes in an Arc-Transform Junction Revealed by New Geochemistry and Geochronology of the ~29–18 Ma Sonya Creek Volcanic Field, Alaska

Berkelhammer¹

2017

Geological Society of America Abstracts With Programs

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The Sonya Creek volcanic field (SCVF) contains the oldest in situ magmatic products in the ~29 Ma-modern Wrangell arc (WA) in south-central Alaska. The WA is located within a transition zone between Aleutian subduction to the west and dextral strike-slip tectonics along the Queen Charlotte-Fairweather and Denali-Duke River fault systems to the east. WA magmatism is due to the shallow subduction (11-16°) WA, and no alkaline lavas that characterize the ~18-10 Ma Yukon WA are present. Sr-Nd-Pb-Hf radiogenic isotope data suggest the SCVF data were generated by contamination of a depleted mantle wedge by ~0.2-4% subducted terrigenous sediment, agreeing with geologic evidence from many places along the southern Alaskan margin. Our combined dataset reveals geochemical and spatial transitions through the lifetime of the SCVF, which record changing tectonic processes during the early evolution of the WA. The earliest SCVF phases suggest the initiation of Yakutat microplate subduction. Early SCVF igneous rocks are also chemically similar to hypabyssal intrusive rocks of similar ages that crop out to the west; together these ~29-20 Ma rocks imply that WA initiation occurred over a <100 km belt, ~50-60 km inboard from the modern WA and current loci of arc magmatism that extends from Mt. Drum to Mt.Churchill.iv

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Constancy of Nb/U in the mantle revisited

Cited by 95 publications

References 59 publications

Destruction of the North China Craton Induced by Ridge Subductions

Destruction of the North China Craton Induced by Ridge Subductions

The geochemical characteristics of Haiyang A-type granite complex in Shandong, eastern China

Initiation of the Wrangell Arc: A Record of Tectonic Changes in an Arc-Transform Junction Revealed by New Geochemistry and Geochronology of the ~29–18 Ma Sonya Creek Volcanic Field, Alaska

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