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to provide a chronostratigraphical
framework for cold-stage deposits in
Greece. The three glacial stages are formally
defined: the Skamnellian Stage,
equivalent to the Elsterian Stage of
northern Europe and marine isotope
stage (MIS) 12; the Vlasian Stage,
equivalent to the late Saalian Stage of
northern Europe and MIS 6; and the
Tymphian Stage, which is equivalent to
the Weichselian/Wurmian stages of
northern Europe and the Alps, respectively,
and MIS 5d-2. This is the first
formalized chronostratigraphical framework
based on the glacial record to be
established for cold stages in the Mediterranean
and provides a new platform
for paleoclimatological investigations in
the region.
2010010589
犹 他 州 更 新 世 Bonneville 湖 石 灰 华 形
成 的 控 制 因 素 = Controls of tufa development
in Pleistocene Lake Bonneville,
Utah. ( 英 文 ). Felton A; Jewell P W;
Chan M; Currey D. Journal of Geology,
2006, 114(3): 377-389
Prominent tufa localities along the
Provo level (similar to 14,000 C-14 yr B.
P.) shoreline in Pleistocene Lake Bonneville
have been characterized in detail.
Three types of tufa are recognized: capping
tufa, beachrock, and capping tufa
over beachrock. Capping tufa and
beachrock are end members of a continuum
based on variable clastic content.
All three types typically occur on headland
environments that had stable substrate
and little sediment input. Tufa development
correlates with bedrock exposure
and landform orientation, which
in turn are correlated (R-2 = 0.89) with
the longest fetch directions in the basin.
Tufa also tends to be located at major
subbasin divides and in the western portion
of the basin.
2010010590
西 西 里 海 峡 裂 缝 水 下 火 山 作 用 的 岩 石
学 和 地 球 化 学 = Petrology and geochemistry
of submarine volcanism in the
Sicily Channel Rift. ( 英 文 ). Rotolo S G;
Castorina F; Cellura D; Pompilio M.
Journal of Geology, 2006, 114(3): 355-
365
Submarine magmatism in the Sicily
Channel Rift began in the early Pliocene
and lasted until almost 200 yr ago. We
present here petrological and geochemical
data on volcanic rocks dredged from
Graham and Nameless banks and
Pantelleria seamounts in the Pelagian
sector of the Sicily Channel Rift.
Petrological evidence suggests that the
ascent of magmas to the surface was
relatively rapid, probably through channels
superimposed over the major tectonic
discontinuities of the Rift. Major
and trace element data indicate an ocean
island basalt affinity for Graham and
Nameless bank alkaline lavas and a depleted
tholeiitic signature for one
Pantelleria seamount, which had a shallower
mantle source. Sr-Nd-Pb isotopic
compositions suggest a heterogeneous
mantle source involving both focus zone
( FOZO) and high- mu( HIMU) components.
Lead isotopic compositions are
slightly less radiogenic in the tholeiitic
basalt and more radiogenic ( closer to
HIMU) in the alkaline lavas. We hypothesize
that a decompressional melting
mechanism affected the mantle beneath
the Sicily Channel at different levels.
Our data fit in a regional scenario
characterized by the presence of HIMU
or FOZO components in alkaline and
calc-alkaline volcanics all around Sicily.
The explanation for the common isotopic
composition could lie in a ( fossil)
plume head that variably contributed to
magmatogenesis in response to variable
lithospheric stretching.
2010010591
夏 威 夷 第 四 纪 冰 期 - 间 冰 期 气 候 旋 回 =
Quaternary glacial-interglacial climate
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