Data Report: Alteration of Basalts from the Kerguelen Plateau

Plateau, Kerguelen; Kurnosov, Victor B; Zolotarev, Boris P; Artamonov, Andrey; Garanina, Svetlana A; Petrova, V. V.; Eroshchev-Shak, Vadim A; Sokolova, Alla L

doi:10.2973/odp.proc.sr.183.013.2003

Cited by 22 publications

(8 citation statements)

References 14 publications

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“…The two distinct groups of basalts are illustrated in the primitive mantle-normalized incompatible element pattern (figure 6b). The patterns broadly resemble OIB pattern and correspond to the field of the Rajmahal Traps (Storey et al 1992;Kent et al 1997), the Kerguelen Plateau (Weis et al 2001;Ingle et al 2002;Kurnosov et al 2003) and the STGB (Ghatak and Basu 2011). Samples 7 and 10 display marked enrichments in trace elements compared with samples 1, 5, and 6.…”

Section: Whole-rock Geochemistrymentioning

confidence: 64%

“…The Sylhet Trap basalts can be correlated with basalts at the Rajmahal Traps (Storey et al 1992;Kent et al 1997) and the Kerguelen Plateau (Weis et al 2001;Ingle et al 2002;Kurnosov et al 2003), having similar age and geochemical compositions Basu 2011, 2013). Here we will discuss the petrography and mineralogy, geochemistry, Nd-Sr-Pb isotope geochemistry, and K-Ar dating for a primitive sample (sample 7) as presented in the results section.…”

Section: Discussionmentioning

confidence: 95%

“…Sr-Nd-Pb isotopic analyses are presented in table 4 and plotted in figure 7 in comparison with the STGB Basu 2011, 2013), the Rajmahal Traps (Storey et al 1992;Kent et al 1997), the Kerguelen Plateau (Weis et al 2001;Ingle et al 2002;Kurnosov et al 2003), and the Ninety-East Ridge (Mahoney et al 2002). 87 Sr/ 86 Sr (I) and 143 Nd/ 144 Nd (I) range from 0.70435 to 0.71357 and 0.51196 to 0.51266, respectively.…”

Section: Sr-nd-pb Isotope Geochemistrymentioning

confidence: 99%

“…Filled areas indicate the field of the Rajmahal (Storey et al 1992;Kent et al 1997) (Frey et al 2000a(Frey et al , b, 2002Ingle et al 2002;Neal et al 2002), and continental clasts from Site 1137 (Ingle et al 2002) are shown for comparison. (Weis et al 2001;Ingle et al 2002;Kurnosov et al 2003), Rajmahal (Storey et al 1992;Kent et al 1997), STGB (Ghatak and Basu 2011), Chilka granulites (Chakrabarti et al 2011) and ODP-1137 (Frey et al 2002) are also shown for comparison. NHRL: Northern Hemispheric Reference Line (Hart 1984).…”

Section: Kerguelen Plume-like Componentmentioning

confidence: 99%

“…A recent geochemical and Nd-Sr-Pb isotopic study on the Sylhet Traps (STGB) from the Cherrapunji-Shella bazaar (CH) and Mawsynram-Balot (MB) sections in the Shillong Plateau (Ghatak and Basu 2011) suggested that the Sylhet Traps basalt of the CH section is associated with E-MORB; whereas, basalts from the MB section involve lower crustal contamination. Rare earth elements (REEs) in the Sylhet Trap basalts are characterized by high La abundance and experience less contamination, similar to the Rajmahal basalt (Storey et al 1992;Kent et al 1997) and the ODP sites on the Karguelen Plateau (Weis et al 2001;Ingle et al 2002;Kurnosov et al 2003). However, since a report on the Sylhet Trap basalts by Palmer (1923), and subsequent geologic, petrochemistry and tectonic studies (Talukdar 1966;Talukdar and Murthy 1971) were performed, there has been limited research in this area.…”

Section: Introductionmentioning

confidence: 99%

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Mantle source characterization of Sylhet Traps, northeastern India: A petrological and geochemical study

2014

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In this study, mineralogical, geochemical, and isotopic data are presented for the Sylhet Trap at the southern flank of the eastern Shillong Plateau, northeastern India, to determine the magma genesis in relation to the Kerguelen plume mantle source. Sylhet Trap rocks are porphyritic tholeiite and have diverse chemical compositions from picro-basalt, basalt, andesite to dacite, but mostly are within the subalkaline field. Major and trace element data were used to identify two distinct magma fractionation trends, a low and medium K series, characterized by relatively flat MORB-like (analogous to Rajmahal Traps (II)) and enriched OIB chondrite-normalized Rare Earth Element (REE) patterns. Initial 87 Sr/ 86 Sr, 143 Nd/ 144 Nd, and 206 Pb/ 204 Pb isotope compositions were widely varied, ranging from 0.70435-0.71357, 0.51196-0.51266, and 17.92-19.72, respectively, when compared with basalts from the West Bengal, the Rajmahal Traps and the Kerguelen plume. Correlations among isotopic and trace element ratios of the Sylhet Traps provide evidence for the involvement of (1) HIMU-like mantle component, (2) the Kerguelen plume-like component, and (3) EMII-like crustal component. Magma from the Sylhet Traps was originated from a melting that derived directly from the heterogeneous Kerguelen mantle plume (components 1 and 2), which strongly suggests the presence of the Kerguelen plume-head in the Bengal basin.

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Section: Whole-rock Geochemistrymentioning

confidence: 64%

Section: Discussionmentioning

confidence: 95%

Section: Sr-nd-pb Isotope Geochemistrymentioning

confidence: 99%

Section: Kerguelen Plume-like Componentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mantle source characterization of Sylhet Traps, northeastern India: A petrological and geochemical study

2014

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Evolution of the Southwest Australian Rifted Continental Margin During Breakup of East Gondwana: Results From International Ocean Discovery Program Expedition 369

Harry

Tejada

Lee

et al. 2020

Geochem Geophys Geosyst

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International Ocean Discovery Program Expedition 369 drilled four sites on the southwestern Australian continental margin, in the deep water Mentelle Basin (MB) and on the neighboring Naturaliste Plateau (NP). The drillsites are located on continental crust that continued rifting after seafloor spreading began further north on the Perth Abyssal Plain (PAP) between magnetochrons M11r and M11n (133-132 Ma), ending when spreading began west of the NP between chrons M5n and M3n (126-124 Ma). Drilling recovered the first in-situ samples of basalt flows overlying the breakup unconformity on the NP, establishing a magnetostratigraphically constrained eruption age of >131-133 Ma and confirming a minimal late Valanginian age for the breakup unconformity (coeval with the onset of PAP seafloor spreading). Petrogenetic modeling indicates the basalts were generated by 25% melting at 1.5 GPa and a potential temperature of 1380-1410 °C, consistent with proximity of the Kerguelen plume during breakup. Benthic foraminiferal fossils indicate that the NP remained at upper bathyal or shallower depths during the last 6 Myr of rifting and for 3-5 Myr after breakup between India and Australia. The limited subsidence is attributed to heat from the nearby Kerguelen plume and PAP spreading ridge. The margin subsided to middle bathyal depths by Albian time and to lower bathyal (NP) or greater (MB) depths by late Paleogene time. Periods of rapid sedimentation accompanied a westward jump of the PAP spreading ridge (108 Ma), rifting on the southern margin (100-84 Ma), and opening of the southern seaway between Australia and Antarctica (60-47 Ma).

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(Table T78) Chemical composition of basalts from ODP Hole 1136A, Leg 183 (Kerguelen Plateau, Indian Ocean)

Kurnosov,

Zolotarev,

Artamonov

et al. 2008

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Data Report: Alteration of Basalts from the Kerguelen Plateau

Cited by 22 publications

References 14 publications

Mantle source characterization of Sylhet Traps, northeastern India: A petrological and geochemical study

Mantle source characterization of Sylhet Traps, northeastern India: A petrological and geochemical study

Evolution of the Southwest Australian Rifted Continental Margin During Breakup of East Gondwana: Results From International Ocean Discovery Program Expedition 369

(Table T78) Chemical composition of basalts from ODP Hole 1136A, Leg 183 (Kerguelen Plateau, Indian Ocean)

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