Origin and evolution of the South Carpathians basement (Romania)

A zircon and monazite geochronologic study of its Alpine sedimentary cover

Adriana M. Stoica, Mihai N Ducea, Relu D. Roban, Denisa Jianu

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

This study investigates the advantages of a multi-mineral approach in detrital mineral geochronology, as tracers of regional tectonic events. We present new detrital zircon and monazite ages on six sands and sandstones collected from the South Carpathians, Romania. They represent clastic sediments derived from the pre-Alpine basement and related sedimentary cover, which accumulated in distinct palaeogeographic and geotectonic environments, during the multiphase Alpine tectonic evolution. Three samples are mid-Cretaceous sandstones from different depositional settings of the syn-tectonic clastic wedge that activated during the intra-Albian thrusting phase. One is Upper Cretaceous sandstone from the South Carpathian foredeep, associated with the intra-Maastrichtian thrusting phase. Two additional samples are Quaternary fluvial deposits reworking the Upper Cretaceous hinterland basin siliciclastic deposits. Detrital zircon U-Pb ages confirm periods of zircon-producing magmatism in the Neoproterozoic (ca. 590-850 Ma), Cambrian-Ordovician (ca. 540-450 Ma), and, in one sample, Late Cretaceous (ca. 76-81 Ma). Precambrian tectonics is documented by inherited zircons (ca. 0.9-1.2 Ga, 1.8-2.2 Ga, 2.6-2.8 Ga), most likely recycled from metasedimentary rock units from the Getic basement. Zircon age distribution patterns from all samples are consistent with derivation from eroded equivalents to basement rocks of the Getic-Supragetic thrust sheets. In contrast, chemical ages on all detrital monazites document a single metamorphic event of Late Devonian to Carboniferous ages (ca. 300-400 Ma), coincident with the Variscan orogeny in central Europe. A small proportion of the zircon population is also of the same age range (ca. 380-320 Ma) - those zircons typically have high U-Th ratios, characteristic of metamorphic zircons. Detrital monazite ages are consistent with previous limited geochronological data on high-pressure metamorphic rocks from the Getic-Supragetic basement. In addition to the timing of tectonic events in the Carpathian basement, geochronology of detrital minerals brings new constraints regarding the duration of these events.

Original languageEnglish (US)
Pages (from-to)510-524
Number of pages15
JournalInternational Geology Review
Volume58
Issue number4
DOIs
StatePublished - Mar 11 2016

Fingerprint

monazite
zircon
Cretaceous
tectonics
sandstone
geochronology
siliciclastic deposit
clastic sediment
new mineral
forearc basin
metasedimentary rock
mineral
basement rock
Maastrichtian
reworking
Hercynian orogeny
tectonic evolution
age structure
fluvial deposit
metamorphic rock

Keywords

  • Detrital
  • geochronology
  • monazite
  • palaeotectonic evolution
  • provenance
  • South Carpathians
  • zircon

ASJC Scopus subject areas

  • Geology

Cite this

Origin and evolution of the South Carpathians basement (Romania) : A zircon and monazite geochronologic study of its Alpine sedimentary cover. / Stoica, Adriana M.; Ducea, Mihai N; Roban, Relu D.; Jianu, Denisa.

In: International Geology Review, Vol. 58, No. 4, 11.03.2016, p. 510-524.

Research output: Contribution to journalArticle

@article{cb4c73f7c22648e88c43ef020fc52fa3,
title = "Origin and evolution of the South Carpathians basement (Romania): A zircon and monazite geochronologic study of its Alpine sedimentary cover",
abstract = "This study investigates the advantages of a multi-mineral approach in detrital mineral geochronology, as tracers of regional tectonic events. We present new detrital zircon and monazite ages on six sands and sandstones collected from the South Carpathians, Romania. They represent clastic sediments derived from the pre-Alpine basement and related sedimentary cover, which accumulated in distinct palaeogeographic and geotectonic environments, during the multiphase Alpine tectonic evolution. Three samples are mid-Cretaceous sandstones from different depositional settings of the syn-tectonic clastic wedge that activated during the intra-Albian thrusting phase. One is Upper Cretaceous sandstone from the South Carpathian foredeep, associated with the intra-Maastrichtian thrusting phase. Two additional samples are Quaternary fluvial deposits reworking the Upper Cretaceous hinterland basin siliciclastic deposits. Detrital zircon U-Pb ages confirm periods of zircon-producing magmatism in the Neoproterozoic (ca. 590-850 Ma), Cambrian-Ordovician (ca. 540-450 Ma), and, in one sample, Late Cretaceous (ca. 76-81 Ma). Precambrian tectonics is documented by inherited zircons (ca. 0.9-1.2 Ga, 1.8-2.2 Ga, 2.6-2.8 Ga), most likely recycled from metasedimentary rock units from the Getic basement. Zircon age distribution patterns from all samples are consistent with derivation from eroded equivalents to basement rocks of the Getic-Supragetic thrust sheets. In contrast, chemical ages on all detrital monazites document a single metamorphic event of Late Devonian to Carboniferous ages (ca. 300-400 Ma), coincident with the Variscan orogeny in central Europe. A small proportion of the zircon population is also of the same age range (ca. 380-320 Ma) - those zircons typically have high U-Th ratios, characteristic of metamorphic zircons. Detrital monazite ages are consistent with previous limited geochronological data on high-pressure metamorphic rocks from the Getic-Supragetic basement. In addition to the timing of tectonic events in the Carpathian basement, geochronology of detrital minerals brings new constraints regarding the duration of these events.",
keywords = "Detrital, geochronology, monazite, palaeotectonic evolution, provenance, South Carpathians, zircon",
author = "Stoica, {Adriana M.} and Ducea, {Mihai N} and Roban, {Relu D.} and Denisa Jianu",
year = "2016",
month = "3",
day = "11",
doi = "10.1080/00206814.2015.1092097",
language = "English (US)",
volume = "58",
pages = "510--524",
journal = "International Geology Review",
issn = "0020-6814",
publisher = "Bellwether Publishing, Ltd.",
number = "4",

}

TY - JOUR

T1 - Origin and evolution of the South Carpathians basement (Romania)

T2 - A zircon and monazite geochronologic study of its Alpine sedimentary cover

AU - Stoica, Adriana M.

AU - Ducea, Mihai N

AU - Roban, Relu D.

AU - Jianu, Denisa

PY - 2016/3/11

Y1 - 2016/3/11

N2 - This study investigates the advantages of a multi-mineral approach in detrital mineral geochronology, as tracers of regional tectonic events. We present new detrital zircon and monazite ages on six sands and sandstones collected from the South Carpathians, Romania. They represent clastic sediments derived from the pre-Alpine basement and related sedimentary cover, which accumulated in distinct palaeogeographic and geotectonic environments, during the multiphase Alpine tectonic evolution. Three samples are mid-Cretaceous sandstones from different depositional settings of the syn-tectonic clastic wedge that activated during the intra-Albian thrusting phase. One is Upper Cretaceous sandstone from the South Carpathian foredeep, associated with the intra-Maastrichtian thrusting phase. Two additional samples are Quaternary fluvial deposits reworking the Upper Cretaceous hinterland basin siliciclastic deposits. Detrital zircon U-Pb ages confirm periods of zircon-producing magmatism in the Neoproterozoic (ca. 590-850 Ma), Cambrian-Ordovician (ca. 540-450 Ma), and, in one sample, Late Cretaceous (ca. 76-81 Ma). Precambrian tectonics is documented by inherited zircons (ca. 0.9-1.2 Ga, 1.8-2.2 Ga, 2.6-2.8 Ga), most likely recycled from metasedimentary rock units from the Getic basement. Zircon age distribution patterns from all samples are consistent with derivation from eroded equivalents to basement rocks of the Getic-Supragetic thrust sheets. In contrast, chemical ages on all detrital monazites document a single metamorphic event of Late Devonian to Carboniferous ages (ca. 300-400 Ma), coincident with the Variscan orogeny in central Europe. A small proportion of the zircon population is also of the same age range (ca. 380-320 Ma) - those zircons typically have high U-Th ratios, characteristic of metamorphic zircons. Detrital monazite ages are consistent with previous limited geochronological data on high-pressure metamorphic rocks from the Getic-Supragetic basement. In addition to the timing of tectonic events in the Carpathian basement, geochronology of detrital minerals brings new constraints regarding the duration of these events.

AB - This study investigates the advantages of a multi-mineral approach in detrital mineral geochronology, as tracers of regional tectonic events. We present new detrital zircon and monazite ages on six sands and sandstones collected from the South Carpathians, Romania. They represent clastic sediments derived from the pre-Alpine basement and related sedimentary cover, which accumulated in distinct palaeogeographic and geotectonic environments, during the multiphase Alpine tectonic evolution. Three samples are mid-Cretaceous sandstones from different depositional settings of the syn-tectonic clastic wedge that activated during the intra-Albian thrusting phase. One is Upper Cretaceous sandstone from the South Carpathian foredeep, associated with the intra-Maastrichtian thrusting phase. Two additional samples are Quaternary fluvial deposits reworking the Upper Cretaceous hinterland basin siliciclastic deposits. Detrital zircon U-Pb ages confirm periods of zircon-producing magmatism in the Neoproterozoic (ca. 590-850 Ma), Cambrian-Ordovician (ca. 540-450 Ma), and, in one sample, Late Cretaceous (ca. 76-81 Ma). Precambrian tectonics is documented by inherited zircons (ca. 0.9-1.2 Ga, 1.8-2.2 Ga, 2.6-2.8 Ga), most likely recycled from metasedimentary rock units from the Getic basement. Zircon age distribution patterns from all samples are consistent with derivation from eroded equivalents to basement rocks of the Getic-Supragetic thrust sheets. In contrast, chemical ages on all detrital monazites document a single metamorphic event of Late Devonian to Carboniferous ages (ca. 300-400 Ma), coincident with the Variscan orogeny in central Europe. A small proportion of the zircon population is also of the same age range (ca. 380-320 Ma) - those zircons typically have high U-Th ratios, characteristic of metamorphic zircons. Detrital monazite ages are consistent with previous limited geochronological data on high-pressure metamorphic rocks from the Getic-Supragetic basement. In addition to the timing of tectonic events in the Carpathian basement, geochronology of detrital minerals brings new constraints regarding the duration of these events.

KW - Detrital

KW - geochronology

KW - monazite

KW - palaeotectonic evolution

KW - provenance

KW - South Carpathians

KW - zircon

UR - http://www.scopus.com/inward/record.url?scp=84951877262&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84951877262&partnerID=8YFLogxK

U2 - 10.1080/00206814.2015.1092097

DO - 10.1080/00206814.2015.1092097

M3 - Article

VL - 58

SP - 510

EP - 524

JO - International Geology Review

JF - International Geology Review

SN - 0020-6814

IS - 4

ER -