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Newly found biomorphic microstructures
from the Upper Archaean (Lopian)
rocks from Northern Karelia are described.
Various microorganisms of a
bacterial nature and even cyanobacteria
(and possibly eukaryotic forms) are recognized.
The importance of electron microscopy,
along with traditional methods,
for the study of the earliest manifestations
of life in the Archaean and Early
Proterozoic is emphasized.
2010010106
嗜 盐 的 藻 细 菌 和 蓝 细 菌 群 落 及 在 碳 酸
盐 沉 积 中 所 起 的 作 用 = Halophilic algal-bacterial
and cyanobacterial communities
and their role in carbonate precipitation.
( 英 文 ). Gerasimenko L M;
Mikhodyuk O S. Paleontological Journal,
2009, 43(8): 940-957 14 图 版 .
This work studies the diversity of
cyanobacterial and algal-bacterial communities
of saline water bodies in the
Crimean Peninsula and Altai Region.
Plant-bacterial communities are described
for the first time. The dependence
of the production and destruction
on the season and salinity of the water
body is shown. The development of
planktonic cyanobacteria is related to the
presence of zooplankton, the development
of which is controlled by hydrogen
sulfide. The high hydrogen sulfide tolerance
of benthic cyanobacteria secures
the integrity of cyanobacterial communities.
Observations in nature and laboratory
modeling show that the formation
of mineral layers is restricted to conditions
of supersaturation with mineral
components. Carbonate precipitation can
take place in cyanobacterial communities
under conditions of mixing sea water
enriched with Ca and Mg with continental
water enriched with sodium carbonate.
Cyanobacteria are able to form
and transform various Ca-Mgcarbonates.
Dolomite formation is a derived
process that occurs in cyanobacterial
mats in the presence of sulfatereducing
bacteria. Carbonatization of
cyanobacterial cells is considered using
the example of the unicellular halophilic-alkaliphilic
cyanobacterium Euhalothece
sp. The accomplished study is
of certain interest for interpretation of
geological and paleontological data in
the context of the supposed analogy between
cyanobacterial mats and ancient
stromatolites.
2010010107
马 斯 特 里 赫 特 阶 钙 质 超 微 化 石 Micula
murus 的 纬 度 迁 移 : 对 全 球 气 候 变 化
的 意 义 = Latitudinal migration of calcareous
nannofossil Micula murus in the
Maastrichtian: Implications for global
climate change. ( 英 文 ). Thibault N;
Gardin S; Galbrun B. Geology, 2010,
38(3): 203-206
Micula murus is one of the main calcareous
nannofossil biostratigrapic
markers of Tethyan and Intermediate
provinces in the upper Maastrichtian
(uppermost Cretaceous). A review of its
first occurrence at 14 deep-sea sites and
sections shows that it is time transgressive
from the Tropical Realm of the Atlantic
and Pacific Oceans to the intermediate
latitudes of the North Atlantic,
South Atlantic, Indian Ocean, and the
northern Tethys. M. murus remained
confined to the Tropical Realm for 1.2
m.y. in the early–late Maastrichtian, thus
supporting high-latitudinal thermal gradients.
It subsequently spread out in the
late Maastrichtian to temperate latitudes
and to the Tethys in coincidence with
the onset of a thermohaline circulation
change ca. 67.5 Ma, suggesting a major
change in surface-water circulation and
interocean communications
2010010108
塔 里 木 板 块 塔 中 上 奥 陶 统 良 里 塔 格 组
的 核 形 石 = Oncolites from the Lianglitag
Formation ( Kaitian,Upper Ordovician),Tazhong,Tarim
block,NW China.
( 中 文 ). 张 园 园 ; 杨 海 军 ; 王 建 坡 ; 黄 智 斌 ;
40