High field strength and transition element systematics in island arc and back-arc basin basalts: Evidence for multi-phase melt extraction and a depleted mantle wedge

Woodhead, Jon; Eggins, Stephen; Gamble, J. A.

doi:10.1016/0012-821x(93)90078-n

Cited by 572 publications

(299 citation statements)

References 61 publications

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“…13c and d, 14c). Our geochemical data are also in contrast to that expected for carbonatite contamination of a plume-related source, which would share highly fractionated Zr/Hf ratios (up to 100) and extremely high LREE contents ( 100 ppm) (e.g., Woodhead et al, 1993;Hastie et al, 2011). Most importantly, there is no geological observation supporting the development of an earliest Neoproterozoic plume in the eastern SCB (e.g., Li et al, 1995Li et al, , 2002Yu et al, 2009;Shu et al, 2011).…”

Section: Group 3: Nb-enriched Basalt From a Newly Metasomatised Wedgecontrasting

confidence: 86%

“…Taking into account the analyzed metamorphic grains for Group 1 having Hf model ages of 0.94-1.18 Ga (YK-09A), similar to those of 09WG-58D (1.06-1.40 Ga) and 09WG-74C (1.02-1.35 Ga), the ages of 984 Ma to 969 Ma for the mafic rocks can be considered to represent the formation timing of our samples. Thus our data verify the presence of the earliest Neoproterozoic (∼985-970 Ma) mafic , and Zr vs. Ti/Zr (e) for the metabasic rocks along the Wuyi and Yunkai domains in the Cathaysia Block (e.g., Woodhead et al, 1993;Pearce and Peate, 1995;Condie, 1997). Symbols are same as those in Fig.…”

Section: Age Of the Mafic Igneous Rockssupporting

confidence: 81%

“…13a , 2007). The synthesis of these geochemical characteristics suggests derivation of Group 4 from a refractory wedge source plus subducted-derived fluid flux (e.g., Woodhead et al, 1993;Kerrich, 2000, 2004).…”

Section: Group 4 Showing the Geochemical Affinity To Arc Volcanicsmentioning

confidence: 99%

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Geochronological, geochemical and Nd–Hf–Os isotopic fingerprinting of an early Neoproterozoic arc–back-arc system in South China and its accretionary assembly along the margin of Rodinia

Wang

Zhang

Cawood

et al. 2013

Precambrian Research

226

121

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Keywords:Metabasic rocks MORB-and/or arc-like geochemical signatures Earliest Neoproterozoic Arc and back-arc system Eastern South China Block Periphery of Rodinia a b s t r a c t U-Pb geochronology along with elemental and Nd-Hf-Os isotopic data from the earliest Neoproterozoic metabasic rocks within the Cathaysia Block of the South China Block (SCB) constrain the tectonic setting and paleogeography of the block within the Rodinia supercontinent. The metabasic rocks give zircon U-Pb ages of 969-984 Ma, ε Hf (t) values of +1.8 to +15.3 and Hf model ages of 0.92-1.44 Ga. They are subalkaline basalts that can be geochemically classified into four groups. Group 1 has low Nb contents (1.24-4.33 ppm), highly positive ε Nd (t) values (+4.3 to +5.2), and REE and multi-elemental patterns similar to fore-arc MORB-type basalt. Group 2 has Nb contents ranging from 3.13 ppm to 6.48 ppm, ε Nd (t) of +3.1 to +6.2, low Re and Os contents and high initial Os isotopic ratios, and displays an E-MORB geochemical signature. Group 3 has Nb = 7.18-29.87 ppm, Nb/La = 0.60-1.40, Nb/U = 5.0-37, Ce/Pb = 1.1-6.6, ε Nd (t) = +2.9 to +7.0, 187 Re/ 188 Os = 5.87-8.87 and ␥Os (t) = 178-772, geochemically resembling to the Pickle Nb-enriched basalt. Group 4 has strong LREE/HREE and HREE fractionation and high ε Nd (t) values (+2.3 to +5.6), and is characterized by similar element patterns to arc volcanic rocks. Serpentinites coeval to Group 4 show 187 Os/ 188 Os of 0.1143-0.1442 and ␥Os (t) of −7.8 to +0.1. Groups 1 and 2 are interpreted to originate from the N-MORB and E-MORB-like sources with the addition of an arc-like component, genetically linked to fore-and back-arc settings, respectively. Groups 3 and 4 show inputs of newly subduction-derived melt and fluid in the wedge source. These geochronological and geochemical signatures fingerprint the development of an earliest Neoproterozoic (∼970 Ma) arc-back-arc system along the Wuyi-Yunkai domain of the Cathaysia Block. Regional relationships indicate that the Wuyi-Yunkai arc-back-arc system was one of a series of separate convergent margin settings, which included the Shuangxiwu (∼970-880 Ma) and Jiangnan (∼870-820 Ma) systems that developed in the SCB. The formation and closure of these arc-back-arc systems resulted in the northwestwardly episodic amalgamation of various pieces of the Yangtze and Cathaysia to finally form the SCB. These signatures require the SCB to occupy an exterior accretionary orogen along the periphery of Rodinia during 990-820 Ma, rather than to have formed through Mesoproterozoic Sibao orogenesis within the interior of Rodinia.

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Section: Group 3: Nb-enriched Basalt From a Newly Metasomatised Wedgecontrasting

confidence: 86%

Section: Age Of the Mafic Igneous Rockssupporting

confidence: 81%

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Geochronological, geochemical and Nd–Hf–Os isotopic fingerprinting of an early Neoproterozoic arc–back-arc system in South China and its accretionary assembly along the margin of Rodinia

Wang

Zhang

Cawood

et al. 2013

Precambrian Research

226

121

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“…Complexely zoned crystals, sharp reversals in zoning, sieving, rounding of crystals, and the presence of several generations of feldspars in many samples are all features indicative of periodic influx and recharge of new basic magmas (Eichelberger 1975; Tsuchiyama 1985). This potential range of processes, coupled with the complications of varying degrees of melting of a heterogeneous mantle source (Ellam & Hawkesworth 1988;Edwards et al 1991;Stern et al 1993;Woodhead et al 1993;Hochstaedter et al 1996;Peate et al 1997), possible contributions from the subducting slab (Saundersetal. 1980;Perfitetal.…”

Section: Discussionmentioning

confidence: 99%

Stratigraphy and geochemistry of the Turoa area, with implications for andesite petrogenesis at Mt Ruapehu, Taupo Volcanic Zone, New Zealand

Waight

Price

Stewart

et al. 1999

New Zealand Journal of Geology and Geophysics

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Detailed mapping and sampling on Turoa skifield and surrounding areas on Mt Ruapehu has enabled identification of individual flow packets that represent small scale eruptive events during the major cone-building episodes previously identified on Ruapehu by Graham & Hackett. The area is dominated by plagioclase-pyroxenephyric andesitic lavas of Mangawhero Formation, which are petrographically and geochemically typical of post-120 ka Ruapehu lavas. Although the lavas are from a relatively small area of the volcano, geochemical and isotopic compositions show a range in variation similar to that observed for the entire volcano. Examination of geochemical variations between individual flow packets and also between sequential C98039Received 15 October 1998; accepted 15 June 1999 lava flows indicates complex processes of assimilation and influx of "new", variably evolved and fractionated magmas into high level magma chambers. These chambers are most likely heterogeneous, and individual eruptions may also sample compositionally distinct regions of the same chamber. It is probable that a complex plumbing system exists beneath Ruapehu with at least two levels of magma storage, evolution, and crustal interaction. Consequently, attempts to numerically quantify such a complex system using models such as assimilation-fractional crystallisation processes are inherently oversimplifications.

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“…These features are typical of subduction-related magmas, such as the calc-alkaline volcanic arcs of continental active margins (e.g., Gill 1981;Pearce 1983;Wilson 1989;Walker et al 2001). High Sr and low Nb, Ta and Ti contents, as in the Dehsalm intrusions, are thought to be due to the absence of plagioclase and presence of Fe-Ti oxides in the residue in the source area of the parental magmas (Martin 1999); Nb and Ta impoverishment has also been attributed to earlier depletion events in the mantle source rocks (Woodhead et al 1993;Gust et al 1997). In the case of Ti, and taking into account the geochemical and petrographic evidence discussed above, its negative anomalies are also related to the fractionation of oxides.…”

Section: Trace Element Geochemistrymentioning

confidence: 99%

Sr–Nd isotope geochemistry and tectonomagmatic setting of the Dehsalm Cu–Mo porphyry mineralizing intrusives from Lut Block, eastern Iran

Arjmandzadeh

Santos

2013

Int J Earth Sci (Geol Rundsch)

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The Dehsalm Cu-Mo-bearing porphyritic granitoids belong to the Lut Block volcanic-plutonic belt (central eastern Iran). These rocks range in composition from gabbro-diorite to granite, with dominance of monzonites and quartz monzonites, and have geochemical features of high-K calc-alkaline to shoshonitic volcanic arc suites. Primitive mantle-normalized trace element spider diagrams display strong enrichment in large-ion lithophile elements such as Rb, Ba and Cs and depletions in some high-field strength elements, e.g., Nb, Ti, Y and HREE. Chondrite-normalized plots display significant LREE enrichments, high La N /Yb N and a lack of Eu anomaly. High Sr/Y and La/Yb ratios of Dehsalm intrusives reveal that, despite their K-rich composition, these granitoids show some resemblances with adakitic rocks. A Rb-Sr whole rock-feldspar-biotite age of 33 ± 1 Ma was obtained in a quartz monzonite sample and coincides, within error, with a previous geochronological result in Chah-Shaljami granitoids, further northwest within the Lut Block. ( 87 Sr/ 86 Sr) i and eNd i isotopic ratios range from 0.70481 to 0.70508 and from

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High field strength and transition element systematics in island arc and back-arc basin basalts: Evidence for multi-phase melt extraction and a depleted mantle wedge

Cited by 572 publications

References 61 publications

Geochronological, geochemical and Nd–Hf–Os isotopic fingerprinting of an early Neoproterozoic arc–back-arc system in South China and its accretionary assembly along the margin of Rodinia

Geochronological, geochemical and Nd–Hf–Os isotopic fingerprinting of an early Neoproterozoic arc–back-arc system in South China and its accretionary assembly along the margin of Rodinia

Stratigraphy and geochemistry of the Turoa area, with implications for andesite petrogenesis at Mt Ruapehu, Taupo Volcanic Zone, New Zealand

Sr–Nd isotope geochemistry and tectonomagmatic setting of the Dehsalm Cu–Mo porphyry mineralizing intrusives from Lut Block, eastern Iran

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