Magnetic fabrics and magnetic mineralogical variations in Lava Channel: An example from the Deccan Volcanic Province, India

Sangode, S. J.; Tembhurne, Sayelli; Mahajan, Rasika; Deenadayalan, K.; Meshram, D. C.; Dongre, Ashish; Bhagat, Amarjeet; Satyanarayana, K.

doi:10.1007/s12040-021-01769-x

Cited by 6 publications

(1 citation statement)

References 38 publications

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“…Emplacement in a melt‐rich state is also supported by the apparent imbrication of magnetic foliation, evidenced by variably plunging but almost uniformly trending K 3 within a particular site. Melt‐rich volcanic flows such as the flood basalts present a similar arrangement of magnetic fabrics and K 3 (e.g., Callot et al., 2004; Sangode et al., 2022; Schöbel & De Wall, 2014; Tamrat & Ernesto, 1999). It is uncertain whether these impact melt rock outcrops are part of a large melt sheet or are melt pockets.…”

Section: Discussionmentioning

confidence: 99%

On the Emplacement of the Impact Melt at the Dhala Impact Structure, India

et al. 2023

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We investigate the magnetic fabrics and magnetic mineralogy of the impact melt rock at the Dhala impact structure to understand its emplacement mechanism. Pseudo‐single domains of Ti‐poor magnetite and Ti‐hematite are the prime magnetic carriers in the impact melt rock. The magnetic foliations show a range of dip amounts. The overall trend of the magnetic foliation of the impact melt rock draws a resemblance with the flood basalts or lava flows. A well‐developed magnetic lineation (K1) indicates the strong alignment of Ti‐poor magnetite grains. Therefore, the magnetic carriers may have crystallized and aligned themselves along the flow direction before the emplacement. It may be possible that after the crystallization of the magnetic carriers, the impact melt moved in a semi‐molten state similar to lava flows with temperatures below c. 1,500°C, which is the melting point of Ti‐magnetite and was emplaced as crater‐fill deposits. Among the three principal magnetic susceptibility axes, K1 aligns best with the mesoscopic flow indicators. K1 of individual specimens' trends between NW and SW, while the mean K1 at all the sites trends westward. Thus, at the studied sites, the impact melt flow was dominantly eastward. In the sites located to the NW and W, the eastward flow could be due to gravity‐driven crater inward flow toward the center. At site IM2, which is located to E, the eastward flow of the impact melt is possibly due to crater outward excavation flow.

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Section: Discussionmentioning

confidence: 99%

On the Emplacement of the Impact Melt at the Dhala Impact Structure, India

et al. 2023

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When the lava meets the sea: emplacement of the 2–4 ka San Bartolo lava flow field, Stromboli volcano (Italy)

Shajahan,

Harris,

Zanella

et al. 2024

Bull Volcanol

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When a lava flow enters a body of water, either a lake, sea, river or ocean, explosive interaction may arise. However, when it is an 'a'ā lava flow entering water, a more complex interaction occurs, that is very poorly described and documented in literature. In this paper, we analysed the 2–4 ka San Bartolo lava flow field emplaced on the north flank of Stromboli volcano, Italy. The lava flow field extends from ~ 650 m a.s.l. where the eruptive fissure is located, with two lava channels being apparent on the steep down to the coast. Along the coast the lava flow field expands to form a lava delta ~ 1 km wide characterised by 16 lava ‘Flow’ units. We performed a field survey to characterise the features of lava entering the sea and the associated formation of different components and magnetic measurements to infer the flow fabrics and emplacement process of the lava flow system. We measured the density, porosity and connectivity of several specimens to analyse the effect of lava-water interaction on the content in vesicles and their connectivity and conducted a macroscopic componentry analysis (clast count) at selected sites to infer the character of the eroded offshore segment of the lava flow field and its component flow units. The collected data allowed us to define the main components of a lava delta fed by 'a'ā lava flows, with its channels, littoral units, ramps, lava tubes, and inflated pāhoehoe flows controlled by the arterial 'a'ā flow fronts. The spatial organisation of these components allowed us to build a three-step descriptive model for 'a'ā entering a water. The initial stage corresponds to the entry of channel-fed 'a'ā lava flow into the sea which fragments to form metric blocks of 'a'ā lava. Continued lava supply to the foreshore causes flow units to stall while spreading over this substrate. Subsequent 'a'ā lava flow units ramp up behind the stalled flow front barrier. Lava tubes extending through the stalled flow barrier feed the seaward extension of a bench made of several pāhoehoe flow units.

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Borehole magnetic fabric anomalies in KBH 07 Deccan basalt core from Deep Continental Drilling, western Maharashtra, India

Venkateshwarlu

Sangode

2022

J Earth Syst Sci

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Magnetic fabrics and magnetic mineralogical variations in Lava Channel: An example from the Deccan Volcanic Province, India

Cited by 6 publications

References 38 publications

On the Emplacement of the Impact Melt at the Dhala Impact Structure, India

On the Emplacement of the Impact Melt at the Dhala Impact Structure, India

When the lava meets the sea: emplacement of the 2–4 ka San Bartolo lava flow field, Stromboli volcano (Italy)

Borehole magnetic fabric anomalies in KBH 07 Deccan basalt core from Deep Continental Drilling, western Maharashtra, India

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