Nature of magmatism and sedimentation at a Columbia active margin: Insights from combined U–Pb and Lu–Hf isotope data of detrital zircons from NW India

2013 ◽  
Vol 23 (3) ◽  
pp. 1040-1052 ◽  
Author(s):  
Parampreet Kaur ◽  
Armin Zeh ◽  
Naveen Chaudhri ◽  
Axel Gerdes ◽  
Martin Okrusch
Keyword(s):  
Detrital Zircons ◽  
Hf Isotope ◽  
Active Margin ◽  
Isotope Data

scholarly journals U–Pb ages and Hf-isotope data of detrital zircons from the late Neoarchean-Paleoproterozoic Minas Basin, SE Brazil

2017 ◽  
Vol 291 ◽  
pp. 143-161 ◽  
Author(s):  
Carmen I. Martínez Dopico ◽  
Cristiano Lana ◽  
Hugo S. Moreira ◽  
Lucas F. Cassino ◽  
Fernando F. Alkmim
Keyword(s):  
Detrital Zircons ◽  
Hf Isotope ◽  
Isotope Data ◽  
Se Brazil

scholarly journals The missing link of Rodinia breakup in western South America: A petrographical, geochemical, and zircon Pb-Hf isotope study of the volcanosedimentary Chilla beds (Altiplano, Bolivia)

Geosphere ◽  
2020 ◽  
Vol 16 (2) ◽  
pp. 619-645 ◽  
Author(s):  
Heinrich Bahlburg ◽  
Udo Zimmermann ◽  
Ramiro Matos ◽  
Jasper Berndt ◽  
Nestor Jimenez ◽  
...  
Keyword(s):  
South America ◽  
Age Distribution ◽  
Limited Range ◽  
Detrital Zircons ◽  
Hf Isotope ◽  
Geochemical Data ◽  
Isotope Data ◽  
Final Assembly ◽  
Depositional Age ◽  
Southwestern Amazonia

Abstract The assembly of Rodinia involved the collision of eastern Laurentia with southwestern Amazonia at ca. 1 Ga. The tectonostratigraphic record of the central Andes records a gap of ∼300 m.y. between 1000 Ma and 700 Ma, i.e., from the beginning of the Neoproterozoic Era to the youngest part of the Cryogenian Period. This gap encompasses the time of final assembly and breakup of the Rodinia supercontinent in this region. We present new petrographic and whole-rock geochemical data and U-Pb ages combined with Hf isotope data of detrital zircons from the volcanosedimentary Chilla beds exposed on the Altiplano southwest of La Paz, Bolivia. The presence of basalt to andesite lavas and tuffs of continental tholeiitic affinity provides evidence of a rift setting for the volcanics and, by implication, the associated sedimentary rocks. U-Pb ages of detrital zircons (n = 124) from immature, quartz-intermediate sandstones have a limited range between 1737 and 925 Ma. A youngest age cluster (n = 3) defines the maximum depositional age of 925 ± 12 Ma. This is considered to coincide with the age of deposition because Cryogenian and younger ages so typical of Phanerozoic units of this region are absent from the data. The zircon age distribution shows maxima between 1300 and 1200 Ma (37% of all ages), the time of the Rondônia–San Ignacio and early Sunsás (Grenville) orogenies in southwestern Amazonia. A provenance mixing model considering the Chilla beds, Paleozoic Andean units, and data from eastern Laurentia Grenville sources shows that >90% of the clastic input was likely derived from Amazonia. This is also borne out by multidimensional scaling (MDS) analysis of the data. We also applied MDS analysis to combinations of U-Pb age and Hf isotope data, namely εHf(t) and 176Hf/177Hf values, and demonstrate again a very close affinity of the Chilla beds detritus to Amazonian sources. We conclude that the Chilla beds represent the first and hitherto only evidence of Rodinia breakup in Tonian time in Andean South America.

U-Pb geochronology of Paraná volcanics combined with trace element geochemistry of the zircon crystals and zircon Hf isotope data

2019 ◽  
Vol 89 ◽  
pp. 219-226 ◽  
Author(s):  
Léo A. Hartmann ◽  
Sérgio B. Baggio ◽  
Matheus P. Brückmann ◽  
Daniel B. Knijnik ◽  
Cristiano Lana ◽  
...  
Keyword(s):  
Trace Element ◽  
Hf Isotope ◽  
Trace Element Geochemistry ◽  
Element Geochemistry ◽  
Isotope Data ◽  
Zircon Hf Isotope

scholarly journals Age, HF-isotope systemantics of detritial zircons and the source of conglomerates of the mt. Southern Demerdzhy, Mountainous Crimea

2019 ◽  
pp. 36-61
Author(s):  
S. V. Rud’ko ◽  
N. B. Kuznetsov ◽  
E. A. Belousova ◽  
T. V. Romanyuk
Keyword(s):  
Middle Jurassic ◽  
Age Distribution ◽  
Primary Source ◽  
Upper Jurassic ◽  
Detrital Zircons ◽  
Hf Isotope ◽  
Coarse Grained ◽  
East European ◽  
Scythian Plate ◽  
Isotope Systematics

The U–Pb dating and Hf isotope systematics of detrital zircons from a sandstone interbed in the section of the upper conglomerate sequence of the Mt. South Demerdzhi were carried out. The dominant populations of detrital zircons in the studied sample characterize episodes of magmatic activity within the source of the Upper Jurassic conglomerates. Magmatism was manifested in the Vendian-Cambrian, Carbon-Triassic and Late Jurassic. The åHf values of detrital zircons of these ages indicate the insignificant role of the ancient (Archean–Early Proterozoic) continental crust in the protolith of magmatic chambers. The similarity of the detrital zircons age distribution from the Middle Jurassic and Upper Jurassic conglomerate strata suggests that they are molasses of the Cimmerian orogen. The absence of products of Middle Jurassic magmatism in molasses of the Cimmerian orogen, which we fixed, limits position of the Cimmerian orogen in the southern part of the Scythian plate. It is shown that the primary source of the Precambrian detrital zircons were mobilized within the Cimmerian orogen the crustal fragments of the Peri-Gondwanan origin, rather than the basement complexes of the East European Platform, similar to the complexes of the Ukrainian shield. The reconstruction of the main stages of the accumulation of the coarse-grained strata of the Mountaineous Crimea in the context of the tectonic evolution of the southern margin of Laurasia during the Mesozoic is presented.

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