Widespread ca. 1.4 Ga intraplate magmatism and tectonics in a growing Amazonia

Teixeira, Wilson; Ernst, Richard E.; Hamilton, M. A.; Lima, Gabrielle Aparecida de; Ruiz, Amarildo Salina; Geraldes, Mauro César

doi:10.1080/11035897.2015.1042033

Cited by 17 publications

(17 citation statements)

References 71 publications

(138 reference statements)

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“…A new U-Pb dating on baddeleyite extracted from Salto do Céu sill (Rio Branco region) has recently yielded an upper intercept age of 1439 ± 4 Ma on the U-Pb concordia diagram, which is interpreted as the crystallization age of the rock (Teixeira et al 2016). This age contrasts with the previous 981 ± 2 Ma Ar-Ar age and enables an alternative interpretation for Salto do Céu sills pole.…”

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confidence: 47%

Paleomagnetism of the Amazonian Craton and its role in paleocontinents

et al. 2016

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In the last decade, the participation of the Amazonian Craton on Precambrian supercontinents has been clarified thanks to a wealth of new paleomagnetic data. Paleo to Mesoproterozoic paleomagnetic data favored that the Amazonian Craton joined the Columbia supercontinent at 1780 Ma ago, in a scenario that resembled the South AMerica and BAltica (SAMBA) configuration. Then, the mismatch of paleomagnetic poles within the Craton implied that either dextral transcurrent movements occurred between Guiana and Brazil-Central Shield after 1400 Ma or internal rotation movements of the Amazonia-West African block took place between 1780 and 1400 Ma. The presently available late-Mesoproterozoic paleomagnetic data are compatible with two different scenarios for the Amazonian Craton in the Rodinia supercontinent. The first one involves an oblique collision of the Amazonian Craton with Laurentia at 1200 Ma ago, starting at the present-day Texas location, followed by transcurrent movements, until the final collision of the Amazonian Craton with Baltica at ca. 1000 Ma. The second one requires drifting of the Amazonian Craton and Baltica away from the other components of Columbia after 1260 Ma, followed by clockwise rotation and collision of these blocks with Laurentia along Grenvillian Belt at 1000 Ma. Finally, although the time Amazonian Craton collided with the Central African block is yet very disputed, the few late Neoproterozoic/Cambrian paleomagnetic poles available for the Amazonian Craton, Laurentia and other West Gondwana blocks suggest that the Clymene Ocean separating these blocks has only closed at late Ediacaran to Cambrian times, after the Amazonian Craton rifted apart from Laurentia at ca. 570 Ma.

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confidence: 47%

Paleomagnetism of the Amazonian Craton and its role in paleocontinents

et al. 2016

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“…Although the ca. 1.4 Ga granitoids or mafic rocks commonly occurred in the cratons, such as the North China (Zhang et al, ), Tarim (Ye et al, ), Siberian (Evans & Mitchell, ), Amazonian (Teixeira et al, ), South China (Li, Li, et al, ), African (Hanson et al, ), Antarctican (Borg & Depaolo, ), and Indian cratons (Ratre et al, ), these magmatism exhibit anorogenic characteristics and thus do not support a close relationship to the CTB. Fennoscandia, on the southwest fringe of the Baltica, is the only block with the development of 1.4 Ga orogen related granitoids that possess juvenile Hf isotopic compositions and model ages (2.5–1.5 Ga) similar to those of the CTB (Figures b and ; Brander & Söderlund, ; He et al, ; Heilimo et al, ; Johansson et al, ; Petersson et al, ; Roberts & Slagstad, ; Roberts et al, ).…”

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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“…The Amazonian Craton (AC) is one of the largest cratonic areas in the world (about 4.3 x 105 Km 2 ) divided into two Pre-Cambrian shields, the Guaporé and Guiana Shields, separated by the Amazonas Sedimentary Basin (Tassinari and Macambira 1999). Studies of the tectonic compartmentalization were conducted in the Amazonian Craton during the last forty years including geophysical, geochronological, isotopic and geological data (Cordani et al 1979;Teixeira et al 1989;Tassinari et al 1996;Tassinari and Macambira 1999;Tohver et al 2006;Teixeira et al 2010Teixeira et al , 2015. Tassinari and Macambira (1999) based on Rb-Sr, K-Ar ages, Sm-Nd (model ages), and zircon U-Pb methods, structural trends, lithology, and geophysical evidence subdivided the AC into six major geochronological provinces: The Central Amazonian Province, the continental crust older than 2.3 Ga, divided into two domains: Carajás-Iricoumé Block and the Roraima Block.…”

Section: Regional Geologymentioning

confidence: 99%

Contribution to the understanding of the Rondonia Tin Province granites (SW Amazonian Craton) origin using U-Pb and Lu-Hf in zircon by LA-ICPMS: implications to A-type granite genesis

Debowski¹,

Alves²,

Santos³

et al. 2019

JGSB

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The study of granite rocks is important in order to understand chemical evolution of the continental crust. Their isotopic composition provides information on their magmatic sources, whether being mantle, crust or a mixture of both. In the SW border of the Amazonian Craton, suites of rapakivi granites related with tin-polymetallic mineralization are emplaced within heterogeneous Proterozoic crust. Zircons from eleven rocks from three granite intrusions, Massangana, São Carlos and Caritianas, representative of the Younger Granites of Rondônia have been studied by using laser ablation inductively coupled plasma source mass spectrometry (LA-ICP-MS) in order to obtain U-Pb ages and Hf isotopic compositions. The samples from Massangana massif, show greater range in age (between 1026 -993 Ma) and initial 176 Hf/ 177 Hf = 0.2817-0.2823. The ԐHf values are both negative and positive (-6.2 to +3.4) in some samples, and only negative in others (-14.1 to -1.6) which reflects the heterogeneity of sources. The TDM age varying between 2.40 to 1.61 Ga also indicates that different sources were involved in the formation of these rocks. The samples from São Carlos massif show U-Pb ages between 996 to 974 ± 10 Ma and initial ԐHf between -15 and +11, corresponding to a TDM age range between 2.65 and 1.08 Ga. The samples from Caritianas massif with U-Pb ages of 1001 and 999 Ma, show more initial ԐHf positive values (13 zircon grains) than negative (6 zircon grains), different from the other massifs. The range of initial ԐHf of the Caritianas massif is -1.5 to +8.2, and residence crustal ages between 1.76 and 1.25 Ga. The great variation in the ԐHf values indicates heterogeneity of sources; the Massangana and São Carlos massifs represent mainly crustal melts with a subordinate mantle contribution. The Caritianas massif, which shows more positive values of the ԐHf parameter, seems to have had more mantle contribution than the other massifs studied here. The characterization of the sources of the rapakivi rocks may play an important role in the genesis of cassiterite ore and could represent an important tool for mineral exploration.

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Widespread ca. 1.4 Ga intraplate magmatism and tectonics in a growing Amazonia

Cited by 17 publications

References 71 publications

Paleomagnetism of the Amazonian Craton and its role in paleocontinents

Paleomagnetism of the Amazonian Craton and its role in paleocontinents

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

Contribution to the understanding of the Rondonia Tin Province granites (SW Amazonian Craton) origin using U-Pb and Lu-Hf in zircon by LA-ICPMS: implications to A-type granite genesis

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