Genesis of the Tonian Imorona–Itsindro magmatic Suite in central Madagascar: Insights from U–Pb, oxygen and hafnium isotopes in zircon

Archibald, Donnelly B.; Collins, Alan S.; Foden, John; Payne, Justin L.; Holden, Peter; Razakamanana, Théodore; Waele, Bert De; Thomas, Robert J.; Pitfield, P.E.J.

doi:10.1016/j.precamres.2016.05.014

Cited by 60 publications

(45 citation statements)

References 69 publications

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“…Moreover, given the high δ 18 O values of 870–800 zircon from locally distributed igneous rocks (Figure ) (Wang et al, ; Zhao et al, ), the ultimate source of these 870–800 Ma detrital zircon grains with low‐δ 18 O values in younger strata is suspect. A similar negative excursion of zircon δ 18 O values was also observed from the Tonian (850–750 Ma) igneous rocks in central Madagascar (Archibald et al, )(Figure ). A gradual increase in δ 18 O values occurs from ~840 Ma, reaching a maximum at ~820–810 Ma and returning to submantle values from 800 to 775 Ma (Archibald et al, ) (Figure ).…”

Section: Nw India Madagascar and South China: Coeval Thermal And Tesupporting

confidence: 78%

“…A similar negative excursion of zircon δ 18 O values was also observed from the Tonian (850–750 Ma) igneous rocks in central Madagascar (Archibald et al, )(Figure ). A gradual increase in δ 18 O values occurs from ~840 Ma, reaching a maximum at ~820–810 Ma and returning to submantle values from 800 to 775 Ma (Archibald et al, ) (Figure ). In addition, ~760–750 Ma igneous rocks from the Seychelles also possess low‐δ 18 O signatures, necessitating the involvement of a low‐δ 18 O component in the generation of Seychelles granites (Harris & Ashwal, ).…”

Section: Nw India Madagascar and South China: Coeval Thermal And Tesupporting

confidence: 78%

“…(a) The δ 18 O values versus U‐Pb ages of individual zircon grains from the Malani rhyolite and dacite with the O composition of Neoproterozoic igneous zircon in Madagascar and south China (data adapted from Zheng et al, , , , ; Chen et al, ; Fu et al, ; Liu & Zhang, ; Wang et al, ; Zhao et al, ; Archibald et al, ). The symbols are the same in Figure .…”

Section: Nw India Madagascar and South China: Coeval Thermal And Tementioning

confidence: 99%

“…Zircon grains with low‐to‐negative δ 18 O values are reported from the Neoproterozoic protolith of the Mesozoic Sulu‐Dabie metamorphic rocks, in Neoproterozoic volcanic rocks in Qinling orogenic belt, and in the Tonian‐aged Imorona‐Itsindro Suite in central Madagascar (Archibald et al, ; Chen et al, ; Fu et al, ; Liu & Zhang, ; Zheng et al, ). The generation of these low‐δ 18 O magmas is considered to be related to a rift setting coinciding with the breakup of Rodinia supercontinent.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper we report, for the first time, low‐δ 18 O isotopic compositions of zircon from felsic volcanic rocks from the MIS. These low‐δ 18 O rhyolites in NW India can be genetically linked to synchronous 18 O‐depleted igneous rocks in south China, the Seychelles, and Madagascar (Archibald et al, ; Harris & Ashwal, ; Zhang & Zheng, ). We have evaluated and discussed the 18 O values in combination with radiogenic isotopic data to propose a close linkage among these blocks, which we argue, lay along a convergent plate margin, that is, along the periphery of Rodinia.…”

Section: Introductionmentioning

confidence: 99%

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Low‐δ¹⁸O Rhyolites From the Malani Igneous Suite: A Positive Test for South China and NW India Linkage in Rodinia

Wang

Cawood

Zhou

et al. 2017

Geophysical Research Letters

105

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The Malani igneous suite (MIS) in NW India represents one of the best preserved silicic large igneous provinces. Voluminous silicic lavas of the MIS erupted between ~780–750 Ma. Zircon grains from rhyolite and dacite lavas have oxygen isotopic compositions that include depleted (δ18O = 4.12 to −1.11‰) and enriched (δ18O = 8.23–5.12‰) signatures. The low‐δ18O zircon grains have highly radiogenic Hf isotopic compositions (ƐHf(t) = +13.0 to +3.6), suggesting high‐temperature bulk cannibalization of upper level juvenile mafic crust as an essential mechanism to produce the low‐δ18O felsic magma. Xenocrystic zircon grains in dacites have high δ18O and low ƐHf(t) values for magmas older than 800 Ma, reflecting a dramatic transition in tectono‐thermal regime in NW India during 800–780 Ma. A synchronous transition also occurred in south China and Madagascar, suggesting a spatially linked geodynamic system. NW India and south China together with Madagascar and the Seychelles lay either along the periphery of Rodinia or outboards of the supercontinent with the age of convergent plate margin magmatism coinciding with breakup of the supercontinent.

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Section: Nw India Madagascar and South China: Coeval Thermal And Tesupporting

confidence: 78%

Section: Nw India Madagascar and South China: Coeval Thermal And Tesupporting

confidence: 78%

Section: Nw India Madagascar and South China: Coeval Thermal And Tementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Low‐δ¹⁸O Rhyolites From the Malani Igneous Suite: A Positive Test for South China and NW India Linkage in Rodinia

Wang

Cawood

Zhou

et al. 2017

Geophysical Research Letters

105

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Geology, geochemistry, and geochronology of the Cuihongshan Fe‐polymetallic deposit, Heilongjiang Province, NE China

et al. 2018

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The Cuihongshan deposit is a giant Fe‐polymetallic skarn deposit located in the northern zone of the Lesser Xing'an–Zhangguangcai Range (LXZR), NE China. It is predominantly hosted in skarn contact zones between marble and alkali‐feldspar granites and monzogranites, with minor in fracture zones of granodiorites. Because of dense vegetation cover, complex intrusions, and contact relation between orebodies and rocks, the metallogenesis of the deposit is poorly understood. Here, we present detailed whole‐rock geochemistry, zircon U–Pb geochronology of granitoids, and molybdenite Re–Os isotopic dating data. All of the granitoids in the Cuihongshan deposit area are silica and potassium rich, highly fractionated, showing affinities to high‐fractionated I‐type granites. However, compared with the other granitoids, the Late Triassic alkali‐feldspar granites have higher differentiation index, stronger enrichment in F, W, Mo, Pb, Th, U, and volatiles with partial mineralization. The zircon U–Pb dating of the granodiorite, monzogranite, and alkali‐feldspar granite yielded weighted average ages of 493 ± 4, 194 ± 1, and 204 ± 1 Ma, respectively. The Re–Os dating of molybdenites from the Cuibei and Cuizhong ore sections yielded isochron ages of 205 ± 2 and 204 ± 4 Ma, respectively, which are consistent with the emplacement age of the alkali‐feldspar granite. Combined with the lines of evidence from the contact relationship between the orebodies and alkali‐feldspar granite, the disseminated mineralization and the enrichment in ore‐forming elements and volatiles in the alkali‐feldspar granite, these indicate that the Late Triassic alkali‐feldspar granite rather than the monzogranite as previously reported, has a close genetic relationship with the Cuihongshan deposit. In addition, the alkali‐feldspar granites occur as apophyses and dikes, but the Late Cambrian and Early Jurassic granitoids occur as batholiths. This indicates that, according to the theory that “small intrusions form large deposits”, a potential Late Triassic (~204 Ma) buried batholith might have provided abundant ore‐forming materials. However, the top parts of the Late Cambrian and Early Jurassic granitoids have been denudated, which is unfavourable for significant deposit preservation and mineralization related to the 2 stages of granitoids. This study gives a significant suggestion that exposed, and blind apophyses and dikes should be further considered in the exploration and study of metal deposits in NE China. Three phases of mineralization occurred in the LXZR in the Triassic–Jurassic, namely, porphyry–skarn Cu–Mo polymetallic mineralization (~250–240 Ma), skarn Fe–Pb–Zn polymetallic mineralization (~204–190 Ma), and porphyry Mo polymetallic mineralization (~180–160 Ma). On the basis of regional data, the LXZR experienced subduction and collisional settings during ~260–185 Ma and ~180–160 Ma, respectively. Hence, the Early Triassic (~250–240 Ma) and Late Triassic–Early Jurassic (~204–190 Ma) mineralizations represented by the Baoshan and Cuihongshan deposit...

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Suturing Gondwana in the Cambrian: The Orogenic Events of the Final Amalgamation

Schmitt

Fragoso

Collins

2018

Regional Geology Reviews

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Genesis of the Tonian Imorona–Itsindro magmatic Suite in central Madagascar: Insights from U–Pb, oxygen and hafnium isotopes in zircon

Cited by 60 publications

References 69 publications

Low‐δ¹⁸O Rhyolites From the Malani Igneous Suite: A Positive Test for South China and NW India Linkage in Rodinia

Low‐δ¹⁸O Rhyolites From the Malani Igneous Suite: A Positive Test for South China and NW India Linkage in Rodinia

Geology, geochemistry, and geochronology of the Cuihongshan Fe‐polymetallic deposit, Heilongjiang Province, NE China

Suturing Gondwana in the Cambrian: The Orogenic Events of the Final Amalgamation

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Genesis of the Tonian Imorona–Itsindro magmatic Suite in central Madagascar: Insights from U–Pb, oxygen and hafnium isotopes in zircon

Cited by 60 publications

References 69 publications

Low‐δ18O Rhyolites From the Malani Igneous Suite: A Positive Test for South China and NW India Linkage in Rodinia

Low‐δ18O Rhyolites From the Malani Igneous Suite: A Positive Test for South China and NW India Linkage in Rodinia

Geology, geochemistry, and geochronology of the Cuihongshan Fe‐polymetallic deposit, Heilongjiang Province, NE China

Suturing Gondwana in the Cambrian: The Orogenic Events of the Final Amalgamation

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Product

Resources

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Low‐δ¹⁸O Rhyolites From the Malani Igneous Suite: A Positive Test for South China and NW India Linkage in Rodinia

Low‐δ¹⁸O Rhyolites From the Malani Igneous Suite: A Positive Test for South China and NW India Linkage in Rodinia