The role of ridge subduction in determining the geochemistry and Nd–Sr–Pb isotopic evolution of the Kodiak batholith in southern Alaska

Ayuso, Robert A.; Haeussler, Peter J.; Bradley, Dwight C.; Farris, David W.; Foley, Nora K.; Wandless, G. A.

doi:10.1016/j.tecto.2008.09.029

Cited by 29 publications

(30 citation statements)

References 55 publications

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“…The major minerals in granitoids are quartz, plagioclase, alkali feldspar, biotite, and hornblende. As shown in Figure , granitoids have Ge/Si ratio less than that of MORBs (Ayuso et al, ; Kamei & Takagi, ). They also define a rough trend of Ge/Si decreasing with increasing SiO 2 .…”

Section: Discussionmentioning

confidence: 98%

Ge/Si Partitioning in Igneous Systems: Constraints From Laser Ablation ICP‐MS Measurements on Natural Samples

Lee

Farner

2019

Geochem Geophys Geosyst

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Mineral/melt and intermineral Ge/Si exchange coefficients for nine common rock‐forming silicate minerals were determined by Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA‐ICP‐MS). Ge/Si mineral/melt exchange coefficients were found to vary by up to a factor of 10. In mafic and ultramafic systems, Ge/Si mineral/melt exchange coefficients are less than 1 for plagioclase (0.48) and olivine (0.72), close to 1 for clinopyroxene (1.17) and orthopyroxene (1.07), and greater than 1 for garnet (2.69). In felsic and silicic systems, the Ge/Si mineral/melt exchange coefficient is less than 1 for quartz (0.23), plagioclase (0.67), and potassium feldspar (0.67) but much greater than 1 for biotite (4.80) and hornblende (3.95). We show that early, olivine‐dominated fractionation of primitive basalts does not fractionate Ge/Si significantly, but subsequent cotectic crystallization of plagioclase and pyroxene can increase the Ge/Si ratio from 6 × 10−6 to 7 × 10−6. We show that the only way to decrease Ge/Si during magmatic differentiation is by crystallization of hornblende or biotite (though biotite is typically a late crystallizing phase), consistent with hornblende being a major fractionating phase in hydrous intermediate magmas. The high compatibility of Ge in hornblende makes this element, in conjunction with Si, a potentially useful approach for distinguishing between hornblende and garnet in the source regions of intermediate magmas. The high compatibility of Ge in micas suggests that Ge/Si systematics may also be useful in understanding the origin of ultrapotassic magmas, which are often thought to derive from phlogopite‐rich sources.

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Section: Discussionmentioning

confidence: 98%

Ge/Si Partitioning in Igneous Systems: Constraints From Laser Ablation ICP‐MS Measurements on Natural Samples

Lee

Farner

2019

Geochem Geophys Geosyst

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“…For instance, in modern orogens like the south-central Alaska Range and the southwest Japan (Cole et al, 2006Hung et al, 2007;Kusky et al, 2003;Tsuchiya et al, 2005). Ridge subduction occurred during the Late Paleocene to the Early Eocene time along southern Alaska (Ayuso et al, 2009) and during the Early Cretaceous in southwest Japan (Kamei, 2004;Maruyama et al, 1997). High heat flow through a slab window (DeLong et al, 1979) can induce melting of overlying crustal rocks to form granitic rocks (e.g., the Composite and McKinley granites and Kyushu Island granites) (Hung et al, 2007;Kamei, 2004).…”

Section: Comparisons With Sanukitoids and Ridge Subduction In Other Omentioning

confidence: 99%

Petrogenesis of Early-Permian sanukitoids from West Junggar, Northwest China: Implications for Late Paleozoic crustal growth in Central Asia

et al. 2015

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“…The Kodiak archipelago in Alaska (Figure 1a) consists of a Jurassic to Eocene accretionary complex composed of NW-dipping, thrust-bounded units showing progressively younger ages toward the southeast (Moore et al 1983;Plafker et al 1994) that are intruded by 58-to 59-Ma near-trench granitic rocks reflecting ridge subduction (Farris et al 2006;Ayuso et al 2009). The Ghost Rocks Formation, consisting of the latest Cretaceous-earliest Paleocene ridge-flank deposits, is distributed over the southeastern part of Kodiak Island (Fisher and Byrne 1987).…”

Section: Geological Setting and Occurrences Of Cataclasitesmentioning

confidence: 99%

Fluid-rock interaction recorded in black fault rocks in the Kodiak accretionary complex, Alaska

et al. 2014

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The role of ridge subduction in determining the geochemistry and Nd–Sr–Pb isotopic evolution of the Kodiak batholith in southern Alaska

Cited by 29 publications

References 55 publications

Ge/Si Partitioning in Igneous Systems: Constraints From Laser Ablation ICP‐MS Measurements on Natural Samples

Ge/Si Partitioning in Igneous Systems: Constraints From Laser Ablation ICP‐MS Measurements on Natural Samples

Petrogenesis of Early-Permian sanukitoids from West Junggar, Northwest China: Implications for Late Paleozoic crustal growth in Central Asia

Fluid-rock interaction recorded in black fault rocks in the Kodiak accretionary complex, Alaska

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