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The Talemzane crater (locally named: Crat?re de Maadna) is located
Algeria, 120km southeast of Laghouat. The crater is 1.75km in diameter
and 70m deep. The crater has a raised rim that is made up of outward
dipping limestones. The crest of the rim is made up of large,
disoriented limestone blocks, ranging in size from 1m to 10m.
The target rocks in the area are limestones, and they compose the
crater walls. In many places the limestone has been brecciated, and the
blocks are upturned almost vertically. Several highly fractured zones
are observed in these crater walls, as are brecciated rocks. There is an
abundance of breccia veins in the crater walls. These veins are usually
parallel or perpendicular to the strata. The veins differ in
distribution and thickness, with some veins as thick as 1m. These veins
are filled with a breccia with sub-angular limestone clasts as wide as
10cm, and a calcite cement.
In the lower parts of the crater walls, the limestones are
intensely fractured, and grade into a monomict breccia. This breccia can
also be found outside of the crater, extending about 500m past the rim.
At the foot of the crater wall is a polymict breccia made up of
limestone clasts from different layers that show different stages of
weathering. The cement in this polymict breccia is also calcite, and
forms up to 50% of the breccia. The center of the crater is partially
filled with alluvial sands and clays.
There is petrographic evidence for Talemzane's impact origin.
Thin sections cut from several different rocks have revealed planar
elements in quartz, sometimes accompanied by fluid inclusions. Although
no other evidence of shock metamorphism has been found, planar elements
in quartz are a fairly conclusive sign of an impact event.
The age of Talemzane is hard to estimate. While the crater is
somewhat eroded, the presence of an ejecta blanket suggests that the age
is not too old. However, the crater postdates Pliocene folding of the
local rocks. The age has been roughly constrained to between 3 million
and 0.5 million years.
Principal investigators: Philippe Lambert, Center for Meteorite
Studies, Arizona State University, Tempe, AZ, 85281; John F. McHone Jr.,
Department of Geology, University of Illinois, Urbana, IL 61801; Robert
S. Dietz, Department of Geology, ASU, Tempe, AZ 85281; Messaoud
Houfani, SONAREM, El Harrach, Algiers, Algeria
Global Impact Studies Project
Спутниковая фотография кратера из Google Earth.
Обзор статей (из РЖ ВИНИТИ "Геология и геофизика"):
Сопоставление данных форм ландшафта (группы ям в форме тарелки на
площади водосбора Байян-дянь) с хорошо известными метеоритными кратерами
(Хенбери, Австралия; Метеор, шт. Аризона, СОА; Ауэлул, Мавритания и
Талемцане, Алжир)
(Wang Ruobai, He ZHaoxiong, Wan Wenni, Gao Peizhi, Li Airong, 2004).
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