2020
DOI: 10.1029/2019tc005762
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History of Subduction Polarity Reversal During Arc‐Continent Collision: Constraints From the Andaman Ophiolite and its Metamorphic Sole

Abstract: Subduction polarity reversal during arc-continent collision has been proposed as a key mechanism to initiate new subduction zones. Despite often interpreted, well-exposed geological record that document the reversal is sparse. The ophiolitic lithounits of the Andaman and Nicobar Islands have been proposed to have formed during the initiation of a new subduction zone following the collision of the Woyla Arc of Sumatra with Sundaland (Eurasia). We here present new field, petrological and geochronological data to… Show more

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Cited by 36 publications
(13 citation statements)
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“…The SI mode of the Nagaland locality in the low-T region (#15) cannot be differentiated based solely on the temperature conditions; the metamorphic soles may have formed either during SSI up-dip from the slab tip or during ISI, although a petrologic study suggests intra-oceanic ISI 58 . For the three localities along the western margin of North America (localities #1–3) and Andaman (#16), the overriding plate was continental and colder 7 , 59 . The PT conditions at these localities fall in the intermediate temperature range.…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…The SI mode of the Nagaland locality in the low-T region (#15) cannot be differentiated based solely on the temperature conditions; the metamorphic soles may have formed either during SSI up-dip from the slab tip or during ISI, although a petrologic study suggests intra-oceanic ISI 58 . For the three localities along the western margin of North America (localities #1–3) and Andaman (#16), the overriding plate was continental and colder 7 , 59 . The PT conditions at these localities fall in the intermediate temperature range.…”
Section: Discussionmentioning
confidence: 99%
“…Based on our modeling results, the cold overriding plate and the intermediate temperature range favor neither SSI nor ISI. However, some regional studies on Cascadia, California, and Andaman (#2, 3, 16) suggest ISI due to subduction polarity reversal 7 , 59 . The dynamics of subduction polarity reversal and its impact on the slab surface temperature are not included in our model and may contribute to anomalous conditions.…”
Section: Discussionmentioning
confidence: 99%
“…In the eastern Neotethys, a mid-Cretaceous collision of the intra-oceanic Woyla Arc with the Sundaland continental margin led to a subduction polarity reversal initiating eastward subduction below Sundaland 36 , which is recorded in ophiolites on the Andaman Islands. There, metamorphic sole rocks with 40 Ar/ 39 Ar hornblende cooling ages of 105-106 Ma, and likely coeval SSZ ophiolite spreading ages 37 reveal that this subduction zone may have developed slab pull around the same time as the Indian Ocean-western Neotethys plate boundary formed (Fig 1C). However, eastward slab pull below Sundaland cannot drive E-W convergence in the Neotethys to the west, and Andaman SSZ extension may well be an expression rather than the trigger of Indian plate rotation.…”
Section: Identifying Potential Drivers Of Subduction Initiationmentioning
confidence: 99%
“…A key role, however, is possible for the only remaining geodynamic, non-plate-tectonic, plate-motion driver in the region: a mantle plume. India-Madagascar continental breakup is widely viewed 13,27,37 as related to the ~94 Ma and younger formation of the Morondava Large Igneous Province (LIP) on Madagascar 38 and southwest India 39 . This LIP, however, started forming ~10 Ma after initial plate boundary formation.…”
Section: Identifying Potential Drivers Of Subduction Initiationmentioning
confidence: 99%
“…Additionally, the discrepancy of the evolution duration between these two SPR events is also hard to understand. According to geochemical dating results, most SPR events, including Ryukyu, usually last for more than 15 Myrs (Plunder et al., 2020 and the references therein). However, some reconstruction models suggest that the SPR process in New Hebrides is very fast (5–7 Myrs) (Pysklywec et al., 2003; Schellart et al., 2006).…”
Section: Introductionmentioning
confidence: 99%