Subaqueous effusive and explosive phases of late Deccan volcanism: evidence from Mumbai Islands, India

Duraiswami, Raymond A.; Jutzeler, Martin; Karve, Archana V.; Gadpallu, Purva; Kale, M. G.

doi:10.1007/s12517-019-4877-z

Cited by 14 publications

(11 citation statements)

References 64 publications

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“…Absence of vesiculation and low-to no-grade of weathering, together with the presence of fresh shards and rounded accidental lithics differing in dimensions, indicates that they were accumulated by lahars (Di Capua and Scasso, 2020) that reworked the loose rhyodacitic deposits of the TDF. On the contrary, the abundant weathering occurring in the flows intermediate in composition highlights that they were generated by PDCs that mixed with sea water during their motion and transformed into watersupported flows (e.g., Trofimovs et al, 2008;Duraiswami et al, 2019). Provenance of obsidian detritus is discussed in paragraph 7.1.…”

Section: Discussionmentioning

confidence: 99%

“…As shown by many authors, explosive eruptions change their physical behavior when interact with water, resulting in the accumulation of sequences with peculiar stratigraphic and petrographic characteristics (e.g., Trofimovs et al, 2008;Cuitiño and Scasso, 2013;Jutzeler et al, 2014;Di Capua and Groppelli, 2016a, b;Duraiswami et al, 2019). Such eruptions also deliver large amounts of detritus forcing the accumulation of sediments even where other factors (e.g., climate, tectonics) inhibit it (Di Capua and Scasso, 2020).…”

Section: Importance Of the Correct Interpretation Of Volcanogenic Seq...mentioning

confidence: 99%

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Correlating volcanic dynamics and the construction of a submarine volcanogenic apron: An example from the Badenian (Middle Miocene) of North-Eastern Hungary

Capua

Barilaro

Szepesi

et al. 2021

Marine and Petroleum Geology

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Section: Discussionmentioning

confidence: 99%

Section: Importance Of the Correct Interpretation Of Volcanogenic Seq...mentioning

confidence: 99%

Correlating volcanic dynamics and the construction of a submarine volcanogenic apron: An example from the Badenian (Middle Miocene) of North-Eastern Hungary

Capua

Barilaro

Szepesi

et al. 2021

Marine and Petroleum Geology

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“…The subaerial basalts comprise continental intraplate basalts (CIBs), continental flood basalts (CFBs), continental rift basalts (CRBs), and convergent margin basalts (CMBs), whereas the subaqueous basalts comprise oceanic plateau basalts (OPBs), ocean-basin flood basalts (OBFBs), seamount basalts, and submarine ridge basalts (Figure S2 in Supporting Information S1). We note a limited occurrence and geochemical analysis of pillow lava erupted in continental freshwater environments (e.g., lakes and rivers) (Duraiswami et al, 2019), which is not included in our training data set. The compiled raw data set included the labels "subaerial" or "subaquatic," representing each sample's eruptive environment.…”

Section: Compilation Of Training Data and Filteringmentioning

confidence: 99%

Data‐Driven Investigation Reveals Subaerial Proportion of Basalts Since the Early Archean

Liu,

ZhangZhou

2024

Geophysical Research Letters

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The subaerial exposure of the modern continental crust through time remains intensely debated, with estimates of the first exposure ranging from the late Archean to the Neoproterozoic. To constrain when and how much of the continental crust was exposed subaerially during Earth's history, we trained a supervised machine learning model on the compositions of modern subaerial and submerged basalts. Then, we applied this well‐trained model to a refined worldwide data set of basaltic compositions and calculated the mean proportions of basalts erupted subaerially since 3.8 billion years ago (Ga). Our results suggest that ∼20% of the basalts were exposed subaerially in the early Archean, which may have driven the synthesis of biopolymers crucial to the origins and evolution of life. The proportion of subaerial basalts increased markedly during two stages between the late Archean and the Paleoproterozoic before reaching the present‐day level no earlier than ∼1.8 Ga.

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“…The Salsette subgroup contains not only basalt, but also trachyte and rhyolite, as well as felsic and basic tuffs. They partially erupted subaqueously near a paleo coast line, forming pillowed flows and layers of hyaloclastite and explosive volcanic breccia [16,17,31]. In the Salsette subgroup formations of southern Mumbai, seven individual flows were identified, separated by 2 to 5 m thick sedimentary intertrappeans.…”

Section: Geological Setting and Mineralizationmentioning

confidence: 99%

“…Recently, Ottens et al [14] developed a mineralization model for Savda/Jalgaon in the main DVP and concluded with a multistage model that included burial metamorphism and postvolcanic hydrothermal activity. In contrast, the basalts in the Mumbai (formerly Bombay) region erupted in a lagoonal to shallow marine environment, forming pillows and volcaniclastics [15][16][17]. The mineral association appearing in these cavities shows some remarkable differences with respect to those in that area of the main DVP, which consist predominantly of lobate flows.…”

Section: Introductionmentioning

confidence: 99%

The Secondary Minerals from the Pillow Basalt of Salsette-Mumbai, Deccan Volcanic Province, India

2022

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Secondary minerals occur within the tholeiitic basalts of Salsette Island in the greater Mumbai region, as well as in other localities in the Deccan Volcanic Province (DVP). However, the secondary minerals of Salsette Island show remarkable differences with respect to their mineral speciation and precipitation sequence, which are both due to their unique geological environment. The greater Mumbai region is built up by the Salsette subgroup, which represents the youngest sequence of the DVP. It formed subsequently to the main phase of DVP activity in Danian time (62.5 to 61.5 Ma), in the course of the India–Laxmi Ridge–Seychelles breakup. The main part of the Salsette subgroup consists of tholeiitic basaltic flows with pillows, pillow breccia, and hyaloclastite, which formed in contact with brackish and fresh water in a lagoonal environment. In some places, intertrappeans are represented by fossiliferous shallow water sediments. On the top, trachytic and rhyolitic subaqueous volcaniclastics occur, and some dioritic bodies have intruded nearby. Due to differing fluid rock interactions, several distinctly different secondary minerals developed in the void spaces of the hyaloclastite breccia of the interpillow matrix and in the pillow cavities. The highly permeable hyaloclastite breccia formed an open system, where pronounced precipitation occurred in the early phase and at higher temperatures. In contrast, the pillow cavities were a temporally closed system and contained, for example, more low-temperature zeolites. The genesis of the secondary minerals can be summarized as follows: During initial cooling of the volcanic rocks at about 62 Ma, the first mineralization sequence developed with chlorite, laumontite I, quartz, and calcite I. Ongoing magmatic activity caused reheating and the main phase of precipitation at prehnite–pumpellyite facies conditions. During generally decreasing temperatures, in the range of 270–180 °C, babingtonite, laumontite II, prehnite, julgoldite, yugawaralite, calcite II, ilvaite, pumpellyite, and gryolite developed. The fluid contained SiO2 + Al2O3 +FeO + MgO + CaO, and minor MnO and Na2O, and was predominately mineralized by the decomposition of basaltic glass. Further temperature decreases caused zeolite facies conditions and precipitation of okenite I, scolecite, heulandite, stilbite, and finally chabazite I, in the temperature range of 180 °C to less than 100 °C. As FeO, MgO, and MnO were then absent, an interaction of the fluid with plagioclase is indicated. According to Rb-Sr and K-Ar ages on apophyllite-K, a third phase of precipitation with apophyllite-K, okenite II, and chabazite II occurred in the late Eocene to early Oligocene (30–40 Ma). The new hydrothermal fluid additionally contained K2O, and temperatures of 50–100 °C can be expected.

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Subaqueous effusive and explosive phases of late Deccan volcanism: evidence from Mumbai Islands, India

Cited by 14 publications

References 64 publications

Correlating volcanic dynamics and the construction of a submarine volcanogenic apron: An example from the Badenian (Middle Miocene) of North-Eastern Hungary

Correlating volcanic dynamics and the construction of a submarine volcanogenic apron: An example from the Badenian (Middle Miocene) of North-Eastern Hungary

Data‐Driven Investigation Reveals Subaerial Proportion of Basalts Since the Early Archean

The Secondary Minerals from the Pillow Basalt of Salsette-Mumbai, Deccan Volcanic Province, India

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