The cooling history of the late Pliocene Eldzhurtinskiy granite (Caucasus, Russia) and the thermochronological potential of grain-size/age relationships

Hess, Jürgen C.; Lippolt, H. J.; Гурбанов, А. Г.; Michalski, I.

doi:10.1016/0012-821x(93)90092-n

Cited by 63 publications

(27 citation statements)

References 13 publications

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“…Gazis et al, [1995] concluded that between 1.9 and 1.56 Ma the cooling rates were at their maximum and may have been in the range of 200 ø-500øC Myr -l, the cooling rates after that time were probably in the range of 100ø-150øC Myr '•, the denudation rates in the time interval of 1.9-1.56 Ma were as high as 13 mm a -•, the 4øAr/39Ar age estimates on the K-feldspars are unreliable because of excess Ar, and no explanation was found for the discrepancies between this study and the previous analysis [Hess et al, 1993].…”

Section: The Eldzhurtinskiy Granite Complexcontrasting

confidence: 51%

A new method for the estimation of cooling and denudation rates using paramagnetic centers in quartz: A case study on the Eldzhurtinskiy Granite, Caucasus

Grün¹,

Tani²,

Гурбанов³

et al. 1999

J. Geophys. Res.

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Abstract. We present a new method for the assessment of the most recent cooling and denudation rates using paramagnetic centers in quartz measured by electron spin resonance (ESR) spectroscopy. These centers have a relatively low thermal stability. For cooling rates of 40 ø and 1000øC Myr -•, effective closure temperatures vary between 55 ø and 82øC (Ti center) and 49 ø and 64 øC (A1 center), respectively. Samples were collected from two cores that were drilled into the Eldzhurtinskiy Granite, which has an emplacement age of ~2 Ma as measured by U/Pb analyses of zircons. One 1500 rn core was taken from a drill hole into the dome of the granite, a second core of 4000 rn from a drill hole at the base of the Baksan However, the ESR denudation rates underestimate the erosion rate of the Baksan Valley because the geothermal gradient is not equilibrated between the surface and the depth of the annihilation temperatures, 950 and 1800 rn for the A1 and Ti centers, respectively. We conclude that ESR measurements of paramagnetic centers in quartz will allow the reconstruction of landscape dynamics for the past 10-1000 kyr and that in conjunction with U/Pb, fission track, and Ar/Ar analyses it will be possible to develop dynamic models for Quaternary tectonic movements. Aim and Scope of This Study IntroductionThe aim of this study was to demonstrate that electron spin resonance (ESR) measurements of paramagnetic centers can be used for the estimation of denudation and cooling rates, to assess the potential of this method, and to identify the weaknesses on which future research has to be focussed. The cores of the Eldzhurtinskiy Granite were ideally suited for this study: samples could be collected from a very long core to study the thermal stabilities of all centers involved; the present day uplift rate is known (N6-8 mm a -• as measured by a nearby Global Positioning System (GPS) station using a Trimble 4000 SSE system); and it is a very young intrusion, suggesting that the paramagnetic centers would not be saturated.• Research School of Earth Sciences, Australian National University, Canberra, ACT, Australia.

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Section: The Eldzhurtinskiy Granite Complexcontrasting

confidence: 51%

A new method for the estimation of cooling and denudation rates using paramagnetic centers in quartz: A case study on the Eldzhurtinskiy Granite, Caucasus

Grün¹,

Tani²,

Гурбанов³

et al. 1999

J. Geophys. Res.

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“…Such a distribution can be explained in terms of an undisturbed deformational and metamorphic history. If larger differences between the two analysed fractions would appear, two scenarios could be discussed: (i) a detrital component in the \2 lm fraction leading to older ages or (ii) a weak retrograde overprint resulting in higher diffusion in the\0.2 lm fraction (Hess et al 1993, Glasmacher et al 2001) and a rejuvenation of the K/Ar ages. Both scenarios can be excluded.…”

Section: Resultsmentioning

confidence: 99%

The tectonic significance of K/Ar illite fine-fraction ages from the San Luis Formation (Eastern Sierras Pampeanas, Argentina)

Wemmer

Steenken²,

Müller

et al. 2011

Int J Earth Sci (Geol Rundsch)

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The Sierra de San Luis forms the southern tip of the Eastern Sierras Pampeanas in central Argentina. Two narrow belts of low-grade phyllites and quartz arenites, i.e. the San Luis Formation, have accommodated part of the strain-related differential exhumation of the medium-to high-grade metamorphic domains that constitute to the basement complex of the sierra. Eleven phyllite samples were subjected to the K/Ar fine-fraction dating technique. Results are interpreted in relation to the Kübler index of the illites, which indicate epimetamorphic conditions for the majority of the samples. Obtained ages between 330 and 290 Ma cover a period of compressional tectonics in the late Mississippian (Visean/Serpukhovian boundary) followed by the subsidence during the formation of the Paganzo Basin in the provinces of La Rioja and San Luis. These tectonic movements are coincident with the Toco orogeny in northern Chile and southern Bolivia. This suggests that the older K/Ar ages document the compressional stage and that younger ages record the cooling of the basement during the subsequent extensional uplift of the basement.

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“…and further East Mount Kazbek (5047 m a.s.l.). These intrusions are mainly late-collisional, subalkaline granitoids that roughly range between 4.5 and 1.5 Ma (Hess et al 1993;Gazis et al 1995;Nosova et al 2005;Lebedev & Bubnov 2006), and culminate with Quaternary volcanism reaching into the Holocene (Lebedev 2005;Chernyshev et al 2006).…”

Section: Regional Tectonics and Geodynamicsmentioning

confidence: 99%

“…Patterns of age distributions also indicate uplift of 7-4 Ma in some areas, suggesting a strong influence of recent tectonics in the process of exhumation/ uplift. Studies on cooling history of recent granites in the western central Greater Caucasus show ages between 2.5 and 1.2 Ma and suggest uplift rates of 4 mm a 21 (Hess et al 1993), but thermal modelling difficulties linked to the close vicinity of hot intrusives may significantly modify modelling results leading to overestimates of the uplift rates.…”

Section: Uplift-exhumationmentioning

confidence: 99%

Cenozoic-Recent tectonics and uplift in the Greater Caucasus: a perspective from Azerbaijan

et al. 2010

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The Greater Caucasus is Europe's highest mountain belt and results from the inversion of the Greater Caucasus back-arc-type basin due to the collision of Arabia and Eurasia. The orogenic processes that led to the present mountain chain started in the Early Cenozoic, accelerated during the Plio-Pleistocene, and are still active as shown from present GPS studies and earthquake distribution. The Greater Caucasus is a doubly verging fold-and-thrust belt, with a pro-and a retro wedge actively propagating into the foreland sedimentary basin of the Kura to the south and the Terek to the north, respectively. Based on tectonic geomorphology -active and abandoned thrust fronts -the mountain range can be subdivided into several zones with different uplift amounts and rates with very heterogeneous strain partitioning. The central part of the mountain range -defined by the Main Caucasus Thrust to the south and backthrusts to the north -forms a triangular-shape zone showing the highest uplift and fastest rates, and is due to thrusting over a steep tectonic ramp system at depth. The meridional orogenic in front of the Greater Caucasus in Azerbaijan lies at the foothills of the Lesser Caucasus, to the south of the Kura foreland basin.

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The cooling history of the late Pliocene Eldzhurtinskiy granite (Caucasus, Russia) and the thermochronological potential of grain-size/age relationships

Cited by 63 publications

References 13 publications

A new method for the estimation of cooling and denudation rates using paramagnetic centers in quartz: A case study on the Eldzhurtinskiy Granite, Caucasus

A new method for the estimation of cooling and denudation rates using paramagnetic centers in quartz: A case study on the Eldzhurtinskiy Granite, Caucasus

The tectonic significance of K/Ar illite fine-fraction ages from the San Luis Formation (Eastern Sierras Pampeanas, Argentina)

Cenozoic-Recent tectonics and uplift in the Greater Caucasus: a perspective from Azerbaijan

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