Composition and age of Lau Basin and Ridge volcanic rocks: Implications for evolution of an interarc basin and remnant arc

Gill, James B.

doi:10.1130/0016-7606(1976)87<1384:caaolb>2.0.co;2

Cited by 214 publications

(117 citation statements)

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“…Because back-arc rifting often initiates near or within the island arc itself and migrates away through asymmetric spreading, age of rifting and distance from the arc are often related. In general, young rifts close to the arc erupt lavas with more arc-like chemistry, whereas mature back-arc spreading centers erupt lavas closest in composition to MORB (e.g., Gill, 1976;Tarney et al, 1977). This suggests that the 'slab-derived component' may become progressively diluted over time (Sinton et al, 2003).…”

Section: The Composition Of Back-arc Basin Crustmentioning

confidence: 98%

“…Bulk oceanic crust also has a positive Ta-Nb anomaly. Table 9 Major element chemistry of back-arc basin basalts A number of workers have noted a relationship between the age of rifting, distance from the island arc, and lava chemistry (e.g., Gill, 1976;Sinton et al, 2003;Tarney et al, 1977). Because back-arc rifting often initiates near or within the island arc itself and migrates away through asymmetric spreading, age of rifting and distance from the arc are often related.…”

Section: The Composition Of Back-arc Basin Crustmentioning

confidence: 99%

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Composition of the Oceanic Crust

White

Klein²

2014

Treatise on Geochemistry

178

160

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Section: The Composition Of Back-arc Basin Crustmentioning

confidence: 98%

Section: The Composition Of Back-arc Basin Crustmentioning

confidence: 99%

Composition of the Oceanic Crust

White

Klein²

2014

Treatise on Geochemistry

178

160

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“…The depletion of V relative to the incompatible element Ti is a measure of this variation and thus the relative fo2 of the magma and its source. Recent data show that the volatile content (and thus fo,) of magmas erupted in oceanic settings increases in the order: MORB < ocean islands < back-arc basins<island arcs [3][4][5]. However, as we shall see, the actual Ti/V relationships are somewhat complex, for reasons explored below.…”

Section: Introductionmentioning

confidence: 99%

“…1). The bu]k partition coefficient for vanadium, /~v, for the same refractory mineralogies varies from ~ 0.15 (fo: ~ 10-7) to about 1.15 (fo:-~ 10-12) which spans the range of naturallyoccurring oxygen fugacities in most magmatic systems from the reducing conditions prevalent in the source of MORB to the more oxidizing conditions found in many convergent margin settings [3,4,19,20,25]. Curves are drawn for Dv=0.15, 0.45, 0.75, 1.0 and 1.15.…”

Section: Partial Melting and Fractional Crystallizationmentioning

confidence: 99%

Ti-V plots and the petrogenesis of modern and ophiolitic lavas

Shervais

1982

Earth and Planetary Science Letters

1,985

960

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Plots of Ti vs. V for many modern volcanic rock associations are diagnostic of tectonic setting and can be used to determine possible tectonic settings of ophiolites as well. The basis of this plot is the variation in the crystal/liquid partition coefficients for vanadium, which range with increasing oxygen fugacity from > 1 to << 1. Since the partition coefficients for Ti are almost always << 1, the depletion of V relative to Ti is a function of the fo2 of the magma and its source, the degree of partial melting, and subsequent fractional crystallization. Volcanic rocks from modern island arcs have Ti/V ratios of ~20, except for calc-alkaline volcanics which show the effects of magnetite fractionation. MORB and continental flood basalts have Ti/V ratios of about 20-50 and alkaline rocks have Ti/V generally >50. Back-arc basin basalts may have either arc-like or MORB-like Ti/V ratios, and sample suites from single back-arc basins may have Ti/V ratios ranging from 10 to 50. This range in Ti/V ratios in samples from a restricted geographical area may be diagnostic of the back-arc setting. The Ti/V plot is applied here to published data on ophiolites from a variety of postulated settings and in general supports the conclusions of previous investigators. Ophiolites from the western Mediterranean (Corsica, northern Apennines) and the "lower" Karmoy volcanics have Ti/V trends similar to MORB; the "upper" Karmo'y volcanics have alkaline Ti/V ratios. Lavas and tonalites in the Papuan ultramafic belt, the high-Mg andesites of Cape Vogel, and the upper pillow lavas at Troodos all have Ti/V ratios < 20, consistent with formation in an island arc setting. More specific evaluation of the tectonic setting of these and other ophiolites requires application of detailed geologic and petrologic data as well as geochemistry. The Ti/V discrimination diagram, however, is a potentially powerful adjunct to these techniques.

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“…Kuno, 1966;Miyashiro, 1974), mid-ocean ridges, and backarc-basin spreading centers (e.g. Gill, 1976 (Fig. 9), all the samples except one (7233-163.7) plot in the transition zone of primitive arc (oceanic island volcanic rock) and mature arc.…”

Section: Geodynamic Settingmentioning

confidence: 99%

Geology and Geochemistry Constraints on the Genesis of the NO.2 Porphyry Copper-Gold Deposit in the Xiongcun District, Gangdese Porphyry Copper Belt, Tibet, China

Yin¹

2017

Appl Ecol Env Res

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Abstract. The Xiongcun district is located in the western segment of the Gangdese porphyry copper belt (GPCB). The No.2 deposit in the Xiongcun district hosts a measured and indicated resource of 1.34 Mt copper, 76.34 t gold, and 193.78 t silver. The copper-gold mineralization of the No.2 deposit is mainly hosted in the Early Jurassic quartz diorite porphyry which intruded volcano-sedimentary rocks of the Early Jurassic Xiongcun Formation. S and Pb isotopic compositions of the ore sulfides and Re contents of molybdenite suggest a mantle source with minor contamination of subducted sediments for the ore-forming materials. Hydrogen and oxygen isotopic compositions of quartz from the quartz -sulfide veins suggest that the ore-forming fluid was a mixture of magmatic and meteoric water. Geochemical and Sr-Nd-Hf isotopic compositions of the Early Jurassic quartz diorite porphyry suggest that the mineralization of the No.2 deposit formed in an intra-oceanic island arc setting. The magmas of the Early Jurassic quartz diorite porphyry were likely sourced from partial melting of mantle with limited contamination by subducted sediments (ca. 5%). The formation of the porphyry and the No.2 deposit were related to the northward intra-oceanic subduction of the Neo-Tethys oceanic slab during the Early Jurassic.

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Composition and age of Lau Basin and Ridge volcanic rocks: Implications for evolution of an interarc basin and remnant arc

Cited by 214 publications

References 0 publications

Composition of the Oceanic Crust

Composition of the Oceanic Crust

Ti-V plots and the petrogenesis of modern and ophiolitic lavas

Geology and Geochemistry Constraints on the Genesis of the NO.2 Porphyry Copper-Gold Deposit in the Xiongcun District, Gangdese Porphyry Copper Belt, Tibet, China

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