Neoproterozoic–Early Cambrian tectono-magmatic evolution of the Central Iranian terrane, northern margin of Gondwana: Constraints from detrital zircon U–Pb and Hf–O isotope studies

Honarmand, Maryam; Li, Xian‐Hua; Nabatian, Ghasem; Rezaeian, Mahnaz; Etemad‐Saeed, Najmeh

doi:10.1016/j.gr.2016.05.007

Cited by 41 publications

(24 citation statements)

References 121 publications

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“…Along the northern margin of the assembling East Gondwana, Ediacaran‐Cambrian arc‐related magmatic rocks were mainly reported from Iran (Moghadam et al, 2017), North Lhasa (Hu et al, 2018), and Himalayan areas (Cawood et al, 2007; Miller et al, 2001). The Iran Block was linked to northern margin of the East Gondwana neighboring the Arabia and Turkey blocks (Honarmand et al, 2016). The position of the Lhasa Block in East Gondwana is controversial.…”

Section: Discussionmentioning

confidence: 99%

Provenance Evolution of Age‐Calibrated Strata Reveals When and How South China Block Collided With Gondwana

Yang

et al. 2020

Geophysical Research Letters

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The South China Block (SCB) has been regarded by many as an integral part of Gondwana, but proposed timing and processes for its accretion to Gondwana vary and remain contentious, largely owing to the lack of reliable Pan-African age paleomagnetic data and tectono-magmatic records from the SCB. Integrated in situ U-Pb ages and Hf-O isotope analyses of detrital zircons from geochronologically well-calibrated Ediacaran-Cambrian sedimentary rocks of western SCB reveal age populations of 2.51, 1.85, 1.20, 0.80, and 0.52 Ga. Detrital zircon age spectra indicate a major tectonic transition for the SCB during 0.56-0.54 Ga, interpreted to reflect the beginning of the collision between SCB-Indochina and NW India blocks. The collisional event lasted until early Ordovician, leading to the suturing of the SCB-Indochina to the northern margin of East Gondwana. Plain Language Summary The South China Block is thought to be a part of the Gondwana superterrane, which was composed of more than half of all continents 650-400 million years ago (Ma). However, questions of when and how the South China Block collided with Gondwana are yet to be answered. In this study, we conducted provenance analyses of sedimentary rocks whose depositional ages were known via radioisotopic dating and chemo-biostratigraphy in the western South China Block. The results reveal a change in tectonic setting of the South China Block at 560-540 Ma, interpreted as the onset of the collision between the South China Block and India along the northern margin of East Gondwana.

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Section: Discussionmentioning

confidence: 99%

Provenance Evolution of Age‐Calibrated Strata Reveals When and How South China Block Collided With Gondwana

Yang

et al. 2020

Geophysical Research Letters

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“…Crustal incubation time is defined as the difference between the Hf crustal model age and zircon U‐Pb age (T DM C –Age) and commonly used in revealing the crustal evolution (Honarmad et al, ; Li et al, ; Qasim et al, ; Wang et al, , ). Addition of juvenile crust and the reworking of ancient crustal materials would lead to low and high crustal incubation times, respectively (Honarmad et al, ; Li et al, ; Qasim et al, ). It is assumed that a short crustal incubation time (<300 Ma) generally reflects a juvenile material addition (Wang et al, ; Li et al, ; Honarmad et al, ; Qasim et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…Addition of juvenile crust and the reworking of ancient crustal materials would lead to low and high crustal incubation times, respectively (Honarmad et al, ; Li et al, ; Qasim et al, ). It is assumed that a short crustal incubation time (<300 Ma) generally reflects a juvenile material addition (Wang et al, ; Li et al, ; Honarmad et al, ; Qasim et al, ). According to this criteria and few results of crustal incubation time (<300 Ma) in the gap between 1.8 and 1.7 Ga, the crustal evolution of the CTB can be divided into three stages, which are 2.0–1.8, 1.7–1.3, and 1.3–0.9 Ga. For the first two stages, ca.…”

Section: Discussionmentioning

confidence: 99%

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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“…Kahar Formation (Horton et al 2008;Etemad-Saeed et al 2016;Honarmand et al 2016). The Soltanieh Formation consists of supratidal to deep subtidal carbonates and subtidal shale members, including the Lower Shale Member (LSM), and the Upper Shale Member (Kimura & Watanabe, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the provenance of the Soltanieh Formation sediments can provide valuable information to clarify the tectonic setting of northern Iran along the proto-Tethyan margin of Gondwana during late Neoproterozoic -early Cambrian time, which has always been a matter of hot debate. A wide range of tectonic settings has been proposed for the Tethyan margin of Gondwana during this time, from a passive margin (Stocklin, 1968a;Falcon, 1974;Berberian & King, 1981;Samani, 1988;Talbot & Alavi, 1996) to an active marginal setting (Ramezani & Tucker, 2003;Hassanzadeh et al 2008;Horton et al 2008;Etemad-Saeed et al 2015;Moghadam et al 2015;Rossetti et al 2015;Honarmand et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Provenance and geochemical variations across the Ediacaran–Cambrian transition in the Soltanieh Formation, Alborz Mountains, Iran

Etemad‐Saeed

Najafi

2018

Geol. Mag.

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The Soltanieh Formation in the Alborz Mountains of northern Iran is not only a key lithostratigraphic unit for reconstruction of the Iranian geological history, but also a globally outstanding succession to reveal variations in seawater composition across the Precambrian–Cambrian (PC–C) transition. Mineralogical and geochemical data from a continuous stratigraphic record of Lower and Upper Shale members of the Soltanieh Formation are used to define their provenance, tectonic setting as well as geochemical variations during the PC–C transition. The Soltanieh mudrocks are composed of quartz and plagioclase, with minor constituents of illite, chlorite and montmorillonite. The chemical index of alteration, A-CN-K (Al2O3 – CaO + Na2O – K2O) relations, index of compositional variability, and Th/Sc versus Zr/Sc ratios indicate low chemical weathering in source areas, compositionally immature and first-cycle sediments. Immobile trace-element ratios and discrimination diagrams, chondrite-normalized rare Earth element (REE) patterns and negative Eu anomaly, along with low total REE abundances and negligible Ce anomalies, demonstrate that the Soltanieh Formation was mainly derived from proximal felsic-intermediate Cadomian magmatic arc sources and deposited in a continental-arc-related basin on the proto-Tethyan active margin of Gondwana. The palaeoredox indicators exhibit a remarkable change in environmental condition from a suboxic to an oxic state across the PC–C transition from the Kahar Formation to the Upper Shale Member of the Soltanieh Formation. Moreover, a significant upwards increase of P, Ba, and Ca is likely associated with enhanced fluxes of nutrient elements during the PC–C transition, coeval with the building of collisional mountain belts during the amalgamation of Gondwana.

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Neoproterozoic–Early Cambrian tectono-magmatic evolution of the Central Iranian terrane, northern margin of Gondwana: Constraints from detrital zircon U–Pb and Hf–O isotope studies

Cited by 41 publications

References 121 publications

Provenance Evolution of Age‐Calibrated Strata Reveals When and How South China Block Collided With Gondwana

Provenance Evolution of Age‐Calibrated Strata Reveals When and How South China Block Collided With Gondwana

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

Provenance and geochemical variations across the Ediacaran–Cambrian transition in the Soltanieh Formation, Alborz Mountains, Iran

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