U-Pb geochronology and geochemistry from the Kumaun Himalaya, NW India, reveal Paleoproterozoic arc magmatism related to formation of the Columbia supercontinent

Phukon, Purbajyoti; Sen, Koushik; Srivastava, H. K.; Singhal, Saurabh; Sen, Aranya

doi:10.1130/b31866.1

Cited by 40 publications

(18 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Yu et al (2012) suggested a position for Cathaysia block adjacent to Lesser Himalaya of NW India in Columbia based on collisional orogeny at circa 1.9-1.8 Ga in both two blocks. In fact, the allanite ages and widespread felsic volcanic rocks do not support a Paleoproterozoic collision and attendant general metamorphic events in Lesser Himalaya (Kohn et al, 2010;Phukon et al, 2018). In fact, the allanite ages and widespread felsic volcanic rocks do not support a Paleoproterozoic collision and attendant general metamorphic events in Lesser Himalaya (Kohn et al, 2010;Phukon et al, 2018).…”

Section: Palaeoproterozoic Ultradepleted Mantle Reservoir Beneath Catmentioning

confidence: 93%

“…However, competing Paleoproterozoic tectonic settings of north Indian continental margin have been proposed (e.g., anorogenic (rift) and continental arc; Kohn et al, 2010;Singh et al, 2009;Richards et al, 2005). In fact, the allanite ages and widespread felsic volcanic rocks do not support a Paleoproterozoic collision and attendant general metamorphic events in Lesser Himalaya (Kohn et al, 2010;Phukon et al, 2018). In the Paleo-Mesoproterozoic Columbia supercontinent, the 1.8 to 1.5 Ga accretionary orogens and subduction-related magmatic arc system bordering the present-day southern margin of North America, Greenland and Baltica, the western, eastern and southern margins of NAC and the eastern margin of Gawler Craton, the western margin of Amazonia Craton, and the southern margin of North China Craton (Figures 2b and 3a; Rogers & Santosh, 2002;Zhao et al, 2002Zhao et al, , 2004.…”

Section: Palaeoproterozoic Ultradepleted Mantle Reservoir Beneath Catmentioning

confidence: 99%

See 1 more Smart Citation

A Fragment of Columbia Supercontinent: Insight for Cathaysia Block Basement From Tectono‐Magmatic Evolution and Mantle Heterogeneity

Xia

2019

Geophysical Research Letters

View full text Add to dashboard Cite

The origin of the Cathaysia block and its position in Columbia supercontinent are still enigmatic. Paleoproterozoic magmatisms developed in the Cathaysia block due to two episodes of continental back‐arc extension range in ages of circa 1.88–1.85 and 1.78–1.77 Ga. A long‐lived ultradepleted mantle domain with highly incompatible element depletion related to average depleted mantle once underlaid the Cathaysia block is revealed by the highly depleted Hf‐Nd isotopes of the Paleoproterozoic meta‐mafic rocks. A self‐consistent set of geological, geochronological, and geochemical data indicate that the Cathaysia was assembled and then maintained a position off the southern margin of North Australia Craton from the assembly to the accretion of Columbia supercontinent (circa 1.90 to 1.74 Ga). Given the evidence for Cathaysia block, mantle heterogeneity might provide an alternative approach of supercontinent reconstruction.

show abstract

Section: Palaeoproterozoic Ultradepleted Mantle Reservoir Beneath Catmentioning

confidence: 93%

Section: Palaeoproterozoic Ultradepleted Mantle Reservoir Beneath Catmentioning

confidence: 99%

A Fragment of Columbia Supercontinent: Insight for Cathaysia Block Basement From Tectono‐Magmatic Evolution and Mantle Heterogeneity

Xia

2019

Geophysical Research Letters

View full text Add to dashboard Cite

show abstract

“…Thus, the Berinag thrust again occupies a similar structural position as the Ramgarh-Munsiari thrust. In addition, the north, south, and central Chiplakot thrusts underlie the Chiplakot klippe and its Paleoproterozoic orthogneiss (Phukon et al, 2018) and may correlate with the Berinag thrust/Ramgarh-Munsiari thrust. North of the Chiplakot klippe, the Ramgarh-Munsiari thrust sheet, which roots into the immediate Main Central thrust footwall, consists of abundant Paleoproterozoic augen gneiss with a crystallization age of 1860 ± 19 Ma (sample SM11-048; Fig.…”

Section: Tectono-stratigraphic Characterization Of Klippen Rocksmentioning

confidence: 99%

“…North of the Chiplakot klippe, the Ramgarh-Munsiari thrust sheet, which roots into the immediate Main Central thrust footwall, consists of abundant Paleoproterozoic augen gneiss with a crystallization age of 1860 ± 19 Ma (sample SM11-048; Fig. 2A; also see Phukon et al, 2018), and metasedimentary rocks with large negative (−25.6) ε Nd values (sample SM11-049; Fig. 2A).…”

Section: Tectono-stratigraphic Characterization Of Klippen Rocksmentioning

confidence: 99%

Examining the tectono-stratigraphic architecture, structural geometry, and kinematic evolution of the Himalayan fold-thrust belt, Kumaun, northwest India

et al. 2019

View full text Add to dashboard Cite

Existing structural models of the Himalayan fold-thrust belt in Kumaun, northwest India, are based on a tectono-stratigraphy that assigns different stratigraphy to the Ramgarh, Berinag, Askot, and Munsiari thrusts and treats the thrusts as separate structures. We reassess the tectono-stratigraphy of Kumaun, based on new and existing U-Pb zircon ages and whole-rock Nd isotopic values, and present a new structural model and deformation history through kinematic analysis using a balanced cross section. This study reveals that the rocks that currently crop out as the Ramgarh, Berinag, Askot, and Munsiari thrust sheets were part of the same, once laterally continuous stratigraphic unit, consisting of Lesser Himalayan Paleoproterozoic granitoids (ca. 1850 Ma) and metasedimentary rocks. These Paleoproterozoic rocks were shortened and duplexed into the Ramgarh-Munsiari thrust sheet and other Paleoproterozoic thrust sheets during Himalayan orogenesis. Our structural model contains a hinterland-dipping duplex that accommodates ∼541–575 km or 79%–80% of minimum shortening between the Main Frontal thrust and South Tibetan Detachment system. By adding in minimum shortening from the Tethyan Himalaya, we estimate a total minimum shortening of ∼674–751 km in the Himalayan fold-thrust belt. The Ramgarh-Munsiari thrust sheet and the Lesser Himalayan duplex are breached by erosion, separating the Paleoproterozoic Lesser Himalayan rocks of the Ramgarh-Munsiari thrust into the isolated, synclinal Almora, Askot, and Chiplakot klippen, where folding of the Ramgarh-Munsiari thrust sheet by the Lesser Himalayan duplex controls preservation of these klippen. The Ramgarh-Munsiari thrust carries the Paleoproterozoic Lesser Himalayan rocks ∼120 km southward from the footwall of the Main Central thrust and exposed them in the hanging wall of the Main Boundary thrust. Our kinematic model demonstrates that propagation of the thrust belt occurred from north to south with minor out-of-sequence thrusting and is consistent with a critical taper model for growth of the Himalayan thrust belt, following emplacement of midcrustal Greater Himalayan rocks. Our revised stratigraphy-based balanced cross section contains ∼120–200 km greater shortening than previously estimated through the Greater, Lesser, and Subhimalayan rocks.

show abstract

“…1857-1878 Ma, εHf (t) = 9.6 to 1.1) suggest that these granite gneisses were formed in a post-collision environment by melting of ancient continental sources with a small mafic magma input derived from juvenile source. Phukon et al (2017) have also attempted zircon chronology on Munsiari augen gneisses (1970( -1950 and Chiplakot granite gneisses (ca. 1920 Ma) and put forwarded an idea of about 100 Ma span of magmatism related to active subduction along the Proterozoic north Indian continental margin.…”

mentioning

confidence: 99%

Himalayan Magmatic Events

Singh¹,

Kumar²,

Gupta³

et al. 2020

PINSA

Self Cite

View full text Add to dashboard Cite

U-Pb geochronology and geochemistry from the Kumaun Himalaya, NW India, reveal Paleoproterozoic arc magmatism related to formation of the Columbia supercontinent

Cited by 40 publications

References 59 publications

A Fragment of Columbia Supercontinent: Insight for Cathaysia Block Basement From Tectono‐Magmatic Evolution and Mantle Heterogeneity

A Fragment of Columbia Supercontinent: Insight for Cathaysia Block Basement From Tectono‐Magmatic Evolution and Mantle Heterogeneity

Examining the tectono-stratigraphic architecture, structural geometry, and kinematic evolution of the Himalayan fold-thrust belt, Kumaun, northwest India

Himalayan Magmatic Events

Contact Info

Product

Resources

About