New Dates for the Solutrean and Magdalenian of Cantabrian Spain: El Miron and La Riera Caves

Radiocarbon ◽  
2018 ◽  
Vol 60 (3) ◽  
pp. 1013-1016 ◽  
Author(s):  
Lawrence G Straus ◽  
Manuel R González Morales
Keyword(s):  
New Age ◽  
Paleolithic Site ◽  
Rock Wall ◽  
Age Determinations

ABSTRACTThis sixth date list for the prehistoric site of El Mirón Cave (Cantabria, Spain) reports on new age determinations for the earliest and last Solutrean occupations (20.4 and 18.0 14C kyr BP) and for a Lower/Initial Magdalenian level with a possible rock wall (16.75 14C kyr BP). The site has now been dated by 92 radiocarbon (14C) assays. In addition, to help resolve inconsistencies in the 14C chronology of La Riera Cave (Asturias)—the first Paleolithic site in Spain to be extensively 14C-dated back in the 1970s—two AMS assays were done on bones from the Lower and Upper Magdalenian collections (15.1 and 13.5 14C kyr BP).

Pre-Katangan geochronology of Zambia and adjacent parts of Central Africa

1968 ◽  
Vol 5 (3) ◽  
pp. 621-628 ◽  
Author(s):  
J. R. Vail ◽  
N. J. Snelling ◽  
D. C. Rex
Keyword(s):  
Lake Tanganyika ◽  
Central Africa ◽  
New Age ◽  
Orogenic Belt ◽  
Eastern Africa ◽  
Sedimentary Sequence ◽  
Precambrian Rocks ◽  
Late Precambrian ◽  
Orogenic Belts ◽  
Age Determinations

The significance of new age determinations on pre-Katangan (Late Precambrian) rocks and minerals from Zambia and adjacent parts of Tanzania and Rhodesia is discussed. In northwestern Rhodesia, the Lomagundi-Piriwiri sediments were deposited between 2500 and 2000 m.y. ago and were folded along meridional trends at circa 1940 m.y. A later episode of folding and metamorphism along similar trends occurred about 1700 m.y. ago, but only affected the western part of the sedimentary sequence (the Piriwiri Series). This latter date is comparable to that which appears to characterize the Tumbide trend, a N- to NE-trending fold system, in Zambia.In Zambia the Tumbide trend is the oldest tectonic episode preserved in the basement and is found only in isolated blocks and cores into which later tectonisms have not penetrated. The dominant pre-Katangan tectonism is represented by the NE to ENE Irumide trend. Such tectonic trends are particularly well developed in the Irumide Orogenic Belt of northern Zambia and adjacent Tanzania. Age determinations set a younger limit of circa 900 m.y. to this trend and the existence of an Irumide Cycle between about 1600 and 900 m.y. is suggested. The possibility that the relatively unmetamorphosed sediments of the Upper Plateau Series and Abercorn Sandstones at the southern end of Lake Tanganyika, the Mafingi Series of northern Malawi, and the Konse Series of Tanzania, represent near-contemporaneous platform deposition associated with the Irumide belt is considered.From this and other recent studies the distribution of orogenic belts in central and eastern Africa can be revised and a number of features of their pattern and inter-relationships noted.

The Precambrian geochronology of Rajasthan and Bundelkhand, northern India

1970 ◽  
Vol 7 (1) ◽  
pp. 91-110 ◽  
Author(s):  
A. R. Crawford
Keyword(s):  
Field Studies ◽  
New Age ◽  
Peninsular India ◽  
Northern India ◽  
Gneiss Complex ◽  
Granitic Intrusion ◽  
Age Determinations

Many new age determinations are reported for the Precambrian of Rajasthan and Bundelkhand in northern peninsular India. All are by Rb–Sr and mostly from total-rock analyses. They show that the oldest rocks in the area are undated sediments intruded by the Bundelkhand and Berach Granites, dated at about 2550 m.y. The overlying Aravalli System was intruded by granites dated at between 1900 and 2100 m.y., and is succeeded by the Delhi System, which was intruded by granite dated at 1650 m.y. Other granitic intrusion at 950–1000 m.y. was followed by repeated pegmatitic intrusion. The Banded Gneiss Complex of Rajasthan contains components of ages varying from at least 2000 m.y. to less than 1000 m.y. Nepheline-syenites at Kishangarh have an age of 1490 ± 150 m.y., but a biotite in an inclusion gives 970 m.y., which is the age of the Newania carbonatite.These determinations show that the Precambrian sequence in Rajasthan is much older than previously suggested. They confirm the antiquity of the Bundelkhand–Berach craton suggested by field studies, denying its derivation from Aravalli System rocks by granitization.

NEW AGE DETERMINATIONS BY THE LEAD METHOD

1954 ◽  
Vol 60 (3) ◽  
pp. 511-520 ◽  
Author(s):  
J. Laurence Kulp ◽  
George L. Bate ◽  
Bruno J. Giletti
Keyword(s):  
New Age ◽  
Age Determinations

New age controls on the tephrochronology of the southernmost Andean Southern Volcanic Zone, Chile

2018 ◽  
Vol 91 (1) ◽  
pp. 250-264 ◽  
Author(s):  
DJ Weller ◽  
ME de Porras ◽  
A Maldonado ◽  
C Méndez ◽  
CR Stern
Keyword(s):  
Late Glacial ◽  
New Age ◽  
Explosive Eruptions ◽  
Volcanic Zone ◽  
Radiocarbon Age ◽  
Southern Volcanic Zone ◽  
Tephra Layers ◽  
Andean Southern Volcanic Zone ◽  
Lake Cores ◽  
Age Determinations

AbstractThe chronology of over 50 tephra layers preserved in a lake sediment core from Laguna La Trapananda (LLT) in the southern portion of the Andean Southern Volcanic Zone (SSVZ), Chile, is constrained by new radiocarbon age determinations, which span the period from late Pleistocene glacial retreat to the late Holocene. The tephra are correlative with tephra previously described from other lake cores in the region and are attributed to explosive eruptions of the SSVZ volcanoes Mentolat, Hudson, Macá, and potentially Cay. The new age determinations are used to estimate the ages of the >50 tephra in the LLT core, as well as those from the other previously described lake cores in the area, by a Bayesian statistical method. The results constrain the frequency of explosive eruptions of the volcanic centers in the southernmost SSVZ. They indicate that there was essentially no increase in the rate of eruptions from late-glacial to recent times due to deglaciation. They also provide isochrones used to constrain the depositional histories of the small lacustrine systems within which they were deposited and they provide a tephrochronologic tool for other paleoclimatic, paleoecologic, archaeologic and tephrochronologic studies in central Patagonia.

scholarly journals Special Issue: New Age Determinations in the Atlantic Provinces

10.4138/1703 ◽  
1990 ◽  
Vol 26 (3) ◽  
Author(s):  
Robert Raeside ◽  
Sandra M. Barr
Keyword(s):  
New Age ◽  
Special Issue ◽  
Age Determinations

New Age Determinations for the Eocene-Oligocene Boundary Sediments in the Fayum Depression, Northern Egypt

1992 ◽  
Vol 100 (6) ◽  
pp. 647-667 ◽  
Author(s):  
John Kappelman ◽  
Elwyn L. Simons ◽  
Carl C. Swisher
Keyword(s):  
New Age ◽  
Northern Egypt ◽  
Age Determinations

scholarly journals New age determinations for the Banhadão and Itapirapuã complexes in the Ribeira Valley, southern Brazil

2018 ◽  
Vol 48 (2) ◽  
pp. 403-414 ◽  
Author(s):  
Celso de Barros Gomes ◽  
Rogério Guitarrari Azzone ◽  
Excelso Ruberti ◽  
Paulo Marcos de Vasconcelos ◽  
Kei Sato ◽  
...  
Keyword(s):  
New Age ◽  
Southern Brazil ◽  
Age Determinations
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