Decoding Earth’s rhythms: Modulation of supercontinent cycles by longer superocean episodes

Li, Zheng‐Xiang; Spencer, Christopher J.; Ernst, Richard E.; Pisarevsky, S.; Kirscher, Uwe; Murphy, J. Brendan

doi:10.1016/j.precamres.2019.01.009

Cited by 137 publications

(91 citation statements)

References 25 publications

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“…This supercontinent cycle has been the subject of much renewed interest (e.g., Li et al, ). Although Le Pichon and Gaulier () had shown that, assuming random trajectories of dispersed continents and an average velocity, the formation of such a single supercontinent would occur within a geologically reasonable duration, the idea of the formation of a supercontinent during a degree 1 convection episode had been proposed long ago by Vening Meinesz (Heiskanen & Vening Meinesz, ).…”

Section: Discussionmentioning

confidence: 99%

Pangea and the Lower Mantle

2019

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We show that the peripheral Pangea subduction zone closely followed a polar great circle. We relate it to the band of faster-than-average velocities in lowermost mantle. Both structures have an axis of symmetry in the equatorial plane. Assuming geologically long-term stationarity of the deep mantle structure, we propose to use the axis of symmetry of Pangea to define an absolute reference frame. This reference frame is close to the slab remnants and NNR frames of reference but disagrees with hot spot-based frames. We apply this model to the last 400 Myr. We show that a hemispheric supercontinent appeared as early as 400 Ma. However, at 400 Ma, the axis of symmetry was situated quite far south and progressively migrated within the equatorial plane that it reached at 300 Ma. From 300 to 110-100 Ma, it maintained its position within the equatorial plane. We propose that the stationarity of Pangea within a single hemisphere surrounded by subduction zones led to thermal isolation of the underlying asthenosphere and consequent heating as well as a large accumulation of hot plume material. We discuss some important implications of our analysis concerning the proposition that the succession of supercontinents and dispersed continents is controlled by an alternation from a degree 1 to a degree 2 planform.

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Section: Discussionmentioning

confidence: 99%

Pangea and the Lower Mantle

2019

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“…After the breakup of Nuna, its dispersed blocks were subsequently reamalgamated to form Rodinia in the early Neoproterozoic. The interior orogen system causing the assembly of Rodinia can also be revealed by the incomplete breakup of Nuna that results in a short total length of passive margins and orogenic belts (Li et al, ). It has been accepted that the configuration of Rodinia shares a close resemblance to that of Nuna, indicating an incomplete breakup of Nuna (Evans & Mitchell, ; Li, Li, et al, ; Li et al, ; Pisarevsky et al, ; Zhao et al, ; Zhang et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…The interior orogen system causing the assembly of Rodinia can also be revealed by the incomplete breakup of Nuna that results in a short total length of passive margins and orogenic belts (Li et al, ). It has been accepted that the configuration of Rodinia shares a close resemblance to that of Nuna, indicating an incomplete breakup of Nuna (Evans & Mitchell, ; Li, Li, et al, ; Li et al, ; Pisarevsky et al, ; Zhao et al, ; Zhang et al, ). As a sequence, a short global passive margins and orogenic belts were produced during the breakup of Nuna and the assembly of Rodinia, respectively (Bradley, ; Condie et al, ; Li et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…It has been accepted that the configuration of Rodinia shares a close resemblance to that of Nuna, indicating an incomplete breakup of Nuna (Evans & Mitchell, ; Li, Li, et al, ; Li et al, ; Pisarevsky et al, ; Zhao et al, ; Zhang et al, ). As a sequence, a short global passive margins and orogenic belts were produced during the breakup of Nuna and the assembly of Rodinia, respectively (Bradley, ; Condie et al, ; Li et al, ). Therefore, the ε Hf ( t ) array and geological responses to the interior orogen system (1.4–0.9 Ga) are obviously different from those to the exterior orogen system (1.8–1.4 Ga).…”

Section: Discussionmentioning

confidence: 99%

“…Paleogeographic reconstruction of Nuna breakup around 1.5–1.4 Ga and subsequent Rodinia assembly around 1.0–0.9 Ga (Li et al, ; Li, Bogdanova, et al, ; Li, Li, et al, ; Pisarevsky et al, ). The transition from Nuna breakup to Rodinia assembly was accomplished by switching an exterior orogenic system into an interior orogenic system.…”

Section: Discussionmentioning

confidence: 99%

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From Breakup of Nuna to Assembly of Rodinia: A Link Between the Chinese Central Tianshan Block and Fennoscandia

et al. 2019

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The transition from breakup of Nuna (or Columbia, 2.0-1.6 Ga) to assembly of Rodinia (1.0-0.9 Ga) is investigated by means of U-Pb and Lu-Hf data of detrital zircons from three Neoproterozoic metasedimentary rocks in the Central Tianshan Block (CTB), NW China. These data yield six age peaks around 1.0, 1.13, 1.34, 1.4-1.6, 1.75, and 2.6 Ga. Few zircons are detected between 2.0 and 2.5 Ga. The Paleoproterozoic to Neoproterozoic detrital zircons have Hf isotopic compositions (−22.1 to +13.0) similar to those of coeval magmatic rocks in the CTB, indicating a proximal provenance. These results, together with the geological evidence and the presence of 1.4 Ga orogenic granitoids in the CTB, rule out most cratons as the CTB sources but support a Fennoscandia ancestry. Zircon U-Pb ages and Hf isotopic compositions from the CTB and Fennoscandia suggest that from 1.8 to 1.4 Ga, the ε Hf (t) values increased toward more positive values, consistent with an exterior orogen characteristic that the lower crust was replaced by a juvenile arc crust. In contrast, from 1.4 to 0.9 Ga, zircon ε Hf (t) values decreased to more negative values, reflecting an interior orogen, characterized by enhanced contribution of recycled crustal material from collided continental fragments. This marked shift most likely reflected a transition from breakup of Nuna to assembly of Rodinia, accomplished by a transformation from an exterior orogen to an interior one.

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U–Pb zircon geochronology of a pyroclastic rock from the Parsoi Formation, Mahakoshal Group: Implications towards age and tectonics of the Basin in Central Indian Tectonic Zone

et al. 2022

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The Mahakoshal Group of rocks in the Central Indian Tectonic Zone (CITZ) holds the key to documenting the early events in the CITZ evolution and initiation of collision/ accretion between the North and South Indian cratons (NIC, SIC). Centimetre to decimetre-thick conformable pyroclastic beds, sandwiched within the siltstoneargillite metasedimentary succession of the Parsoi Formation allows us to generate (i) a robust depositional age, which otherwise is bracketed based on basement and intrusive age, and (ii) track the earliest record of accretion at the plate margin of NIC.A magmatic origin for the inferred pyroclastic unit is established from petrographic signatures and, in particular, the CL response of quartz grains. The dominance of the Dauphiné twin in fine-grained (~100 μm and <20 μm) quartz fraction implies subaquatic fast-cooling across the phase transition temperature (573 C) of quartz within the pyroclastic rock. A volcanic arc to syn-collisional granite affinity is suggested for the pyroclastic unit based on (i) dacitic to rhyolitic composition, (ii) LILE-enrichment, (iii) HFSE depletion, and (iv) enrichment of Th, U, and Pb. The 207 Pb/ 206 Pb 1894.3 ± 9.4 Ma age of crystallization is estimated from the youngest and most prominent peak of near-concordant oscillatory zoned zircon grain with a high Th/U ratio. The age data is important in documenting the earliest accretion event at the plate margin in the collisional history of NIC and SIC.

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Decoding Earth’s rhythms: Modulation of supercontinent cycles by longer superocean episodes

Cited by 137 publications

References 25 publications

Pangea and the Lower Mantle

Pangea and the Lower Mantle

From Breakup of Nuna to Assembly of Rodinia: A Link Between the Chinese Central Tianshan Block and Fennoscandia

U–Pb zircon geochronology of a pyroclastic rock from the Parsoi Formation, Mahakoshal Group: Implications towards age and tectonics of the Basin in Central Indian Tectonic Zone

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