Geology of the saucer-shaped sill near Mahad, western Deccan Traps, India, and its significance to the Flood Basalt Model

Duraiswami, Raymond A.; Shaikh, Tahira N.

doi:10.1007/s00445-013-0731-4

Cited by 21 publications

(5 citation statements)

References 49 publications

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“…(a) Th/Yb versus Ta/Yb (Pearce, ) and (b) Ba/Th versus La/Sm (Labanieh et al, ) plots showing the mantle source nature of the Mongolian mafic rocks. Some basalts of typical origins in the world are also shown for comparison and the data sources are as follows: NE China: Fan et al, ; Ji et al, ; Yu et al, ; Meng et al, ; Guo et al, ; Sun et al, ; Xu et al, ; Dong et al, ; Li, Liu, et al, ; Li, Hegner, et al, ; Yang et al, ; Columbian Trap: Nivia, Marriner, Kerr, & Tarney, ; Lara et al, ; Ontong Java: Fitton & Godard, ; White, Castillo, Neal, Fitton, & Godard, ; Siberian Trap: Reichowa, Saunders, White, Al'Mukhamedov, & Medvedev, ; Chuvashova, Rasskazov, & Yasnygina, ; Svetlitskaya & Nevolko, ; Emeishan Trap: Xiao, Xu, Chung, & Mei, ; Zi, Fan, Wang, & Peng, ; Deccan Trap: Sheth, Mahoney, & Chandrasekharam, ; Duraiswami & Shaikh, ; East Africa: MacDonald, Rogers, Fitton, Black, & Smith, )…”

Section: Discussionmentioning

confidence: 99%

Petrogenesis and tectonic implication of the Late Mesozoic volcanic rocks in East Mongolia

et al. 2018

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This paper presents new geochemical and geochronological data of the Late Mesozoic volcanic rocks in East Mongolia. These volcanic rocks belong to high‐K calc‐alkaline and shoshonitic series and exhibit features of bimodal rocks. The mafic rocks have elevated incompatible trace element concentrations and significantly negative Nb, Ta, and Ti anomalies, with 87Sr/86Sr(i) and ƐNd(t) values of 0.70502–0.70572 and −1.72459 to +1.720736, respectively, which suggest that the mafic magma was derived from a lithospheric mantle source that might have been metasomatized by subduction‐derived fluids, experienced fractional crystallization, and was contaminated by crustal materials. The felsic rocks have similar rare earth element patterns to the mafic rocks but show much more significantly negative Eu and Sr anomalies. The felsic rocks have higher 87Sr/86Sr(i) values of 0.706496–0.71104 than the mafic rocks but similar ƐNd(t) values (−0.28003 to +2.928506) to the mafic ones. These data indicate that the felsic rocks originated from partial melting of a crustal source that is dominated by juvenile mafic rocks. Our new K‐Ar dating, together with previous data, shows that the Late Mesozoic volcanism in East Mongolia took place during the Late Jurassic‐Early Cretaceous between ca. 155 and 99 Ma. The model of back‐arc extension, possibly induced by slab rollback of the westward subducted Pacific Plate and the subduction zone retreat, can explain the geodynamic setting and the eastward younging trend of the Late Mesozoic volcanism in East Mongolia and in adjacent NE China.

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Section: Discussionmentioning

confidence: 99%

Petrogenesis and tectonic implication of the Late Mesozoic volcanic rocks in East Mongolia

et al. 2018

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“…up 16% of the total areal extent of the Traps (~10 7 km 2 ; Svensen et al, 2009;Burgess et al, 2017). Sills up to 22 m thick are also found within the Deccan Traps, another LIP where dikes appear as the apparent dominant intrusive style (Sheth et al, 2009;Duraiswami and Shaikh, 2013).…”

Section: Dipmentioning

confidence: 99%

The Chief Joseph dike swarm of the Columbia River flood basalts, and the legacy data set of William H. Taubeneck

et al. 2020

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The Miocene Columbia River Basalt Group (CRBG) is the youngest and best studied continental flood basalt province on Earth. The 210,000 km3 of basaltic lava flows in this province were fed by a series of dike swarms, the largest of which is the Chief Joseph dike swarm (CJDS) exposed in northeastern Oregon and southwestern Washington. We present and augment an extensive data set of field observations, collected by Dr. William H. Taubeneck (1923–2016; Oregon State University, 1955–1983); this data set elucidates the structure of the CJDS in new detail. The large-scale structure of the CJDS, represented by 4279 mapped segments mostly cropping out over an area of 100 × 350 km2, is defined by regions of high dike density, up to ~5 segments/km−2 with an average width of 8 m and lengths of ~100–1000 m. The dikes in the CJDS are exposed across a range of paleodepths, from visibly feeding surface flows to ~2 km in depth at the time of intrusion. Based on extrapolation of outcrops, we estimate the volume of the CJDS dikes to be 2.5 × 102–6 × 104 km3, or between 0.1% and 34% of the known volume of the magma represented by the surface flows fed by these dikes. A dominant NNW dike segment orientation characterizes the swarm. However, prominent sub-trends often crosscut NNW-oriented dikes, suggesting a change in dike orientations that may correspond to magmatically driven stress changes over the duration of swarm emplacement. Near-surface crustal dilation across the swarm is ~0.5–2.7 km to the E-W and ~0.2–1.3 km to the N-S across the 100 × 350 km region, resulting in strain across this region of 0.4%–13.0% E-W and 0.04%–0.3% N-S. Host-rock partial melt is rare in the CJDS, suggesting that only a small fraction of dikes were long-lived.

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“…The saucer‐shaped Mahad sill (Duraiswami & Shaikh, 2013) in the southwestern Deccan Traps is one of the few DT sills within the main DT section along with the olivine‐gabbro Khopoli intrusion (Cucciniello et al., 2014). The Mahad sill, the larger of the two, is 7.1 × 5.3 km long and is intruded into a Bushe Formation flow.…”

Section: Magmatic Architecture Observations–deccan Trapsmentioning

confidence: 99%

“…The Mahad sill, the larger of the two, is 7.1 × 5.3 km long and is intruded into a Bushe Formation flow. Since the sill is geochemically associated with either the Poladpur‐ or Ambenali Formation, the sill was emplaced at

<

1 km depth from the surface (Duraiswami & Shaikh, 2013). Based on existing work, none of these sills feed subaerial lava flows.…”

Section: Magmatic Architecture Observations–deccan Trapsmentioning

confidence: 99%

The Magmatic Architecture of Continental Flood Basalts I: Observations From the Deccan Traps

2021

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Geology of the saucer-shaped sill near Mahad, western Deccan Traps, India, and its significance to the Flood Basalt Model

Cited by 21 publications

References 49 publications

Petrogenesis and tectonic implication of the Late Mesozoic volcanic rocks in East Mongolia

Petrogenesis and tectonic implication of the Late Mesozoic volcanic rocks in East Mongolia

The Chief Joseph dike swarm of the Columbia River flood basalts, and the legacy data set of William H. Taubeneck

The Magmatic Architecture of Continental Flood Basalts I: Observations From the Deccan Traps

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