Untitled

李 继 亮 ; 俞 良 军 ; 李 红 生 ; 王 义 天 . 地 质 科
学 , 2002, 37(1): 104-106 2 图 版 .
在 新 疆 木 孜 塔 格 蛇 绿 混 杂 岩 的 燧 石 中 发
现 了 早 石 炭 世 杜 内 期 的 放 射 虫 化 石 , 首 次
为 这 套 蛇 绿 混 杂 岩 提 供 了 时 代 依 据 。 结 合
在 邻 区 的 祁 漫 塔 格 和 可 可 西 里 发 现 的 放 射
虫 , 认 为 青 藏 高 原 北 缘 在 早 石 炭 世 期 间 曾
沿 多 处 裂 解 。 它 们 之 间 可 能 有 狭 窄 的 通 道
相 连 , 是 否 构 成 统 一 的 大 洋 尚 待 进 一 步 研
究 。
2008010157
意 大 利 东 北 部 威 尼 斯 地 区 上 渐 新 统 大 有 孔
虫 = Larger Foraminifera from the Upper Oligocene
of the Venetian Area, North-East Italy.
( 英 文 ). Bassi D; Hottinger L; Nebelsick J H.
Palaeontology, 2007, 50(4): 845-868
A moderately diverse larger foraminiferal
fauna from the north-east Italian ‘Arenarie e
calcari di S. Urbano’ formation with important
stratigraphic, palaeoecological and palaeobiogeographical
implications is described with
respect to its position in the Western Tethys
area. The fauna is dominated by hyaline perforated
and porcellaneous forms including Amphistegina,
Archaias, Austrotrillina,
Miogypsinoides, Neoplanorbulinella, Neorotalia,
Nummulites, Operculina and Spiroclypeus.
The presence of Miogypsinoides
complanatus allows the age of the formation
to be determined as late Chattian (Shallow
Benthic Zone SBZ 23). The palaeoenvironmental
setting is interpreted as a shallow ramp
environment ranging from (1) well lit, highly
translucent, shallowest part of the photic zone
characterized by Archaias and Austrotrillina,
the deeper part of the inner ramp with Nummulites,
to (2) the shallow part of the middle
ramp with Spiroclypeus and miogypsinids and
Operculina, to (3) a deeper middle-ramp setting
dominated by coralline rhodoliths along
with lepidocylinids. The presence of Archaias
hensoni Smout and Eames shows that members
of much more diverse Middle Eastern
associations of shallow-water larger porcellaneous
foraminifera are also present in the
north-western parts of the Western Tethys,
and reveals a corresponding diversity gradient
among larger foraminiferal faunas in the
Western Tethys, which is related to a decrease
in temperature.
2008010158
更 新 世 深 海 底 栖 有 孔 虫 绝 灭 的 南 大 西 洋 记
录 = Pleistocene Extinctions Of Deep-Sea
Benthic Foraminifera: The South Atlantic Record.
( 英 文 ). Óneill T A; Hayward B W; Kawagata
S; Sabaa A T; Grenfell H R. Palaeontology,
2007, 50(5): 1073-1102
Sixty-two species and 19 genera of elongate,
cylindrical benthic foraminifera disappeared
from the deep-sea in the south-east Atlantic
(ODP Sites 1082 and 1083) and the Atlantic
sector of the Southern Ocean (ODP Site 1088)
during the Early and Middle Pleistocene as
part of the global extinction of the families
Pleurostomellidae, Stilostomellidae and portions
of the Nodosariidae. During the mid-
Pleistocene Climate Transition (1·2–0·6 Ma)
in the Southern Ocean, these extinct taxa exhibited
three pulses of glacial decline in abundance
and diversity separated by partial interglacial
recoveries. Beneath the highproductivity
Benguela Current upwelling region
(Sites 1082, 1083), glacial declines in the
extinct taxa were suppressed by favourable
high organic-carbon flux and consequent lowoxygen
bottom conditions. Here two major
pulses of diversity loss occurred at c. 1·3–
1·2 Ma and 1·0–0·7 Ma. At all three locations,
the most dramatic decline in abundance and
diversity occurred c. 0·85–0·80 Ma (marine
isotope stage 20), and the final disappearance
of Extinction Group taxa was completed by
0·67 Ma beneath the Benguela Current and
0·60 Ma in the Southern Ocean. We speculate
that this period of enhanced global extinctions
was linked to a pulsed decline in glacial temperatures
and/or increase in ventilation of
deep and intermediate water masses, associated
with polar ice cap growth since the late
Pliocene.
2008010159
华 南 梅 山 剖 面 二 叠 纪 - 三 叠 纪 集 群 绝 灭 中
的 有 孔 虫 幸 存 分 子 = Foraminiferal survivors
from the Permian-Triassic mass extinction in
the Meishan section, South China. ( 英 文 ).
Song Hai-Jun; Tong Jin-Nan; Zhang Ke-Xin;
Wang Qin-Xian; Z.Q. Chen. palaeoworld,
2007, 16(1-3): 105-119
This paper documents abundant and diverse
foraminifers from Permian-Triassic (P-Tr)
boundary strata and reports for the first time
foraminifers from the Lower Triassic Yinkeng
and Helongshan formations in the Meishan
section, the global stratotype for the P-Tr
boundary. The important foraminifer elements
are illustrated and described. Most of these
foraminifers were the Permian holdovers, occurring
above the main extinction event horizon
(base of Bed 25) at Meishan, and thus
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