You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Academy of Sciences, 2007, 104(36): 14260-<br />
14265 5 图 版 .<br />
Highly cracked and isomerized archaeal<br />
lipids and bacterial lipids, structurally changed<br />
by thermal stress, are present in solvent extracts<br />
of 2,707- to 2,685-million-year-old (Ma)<br />
metasedimentary rocks from Timmins, ON,<br />
Canada. These lipids appear in conventional<br />
gas chromatograms as unresolved complex<br />
mixtures and include cyclic and acyclic biphytanes,<br />
C 36 –C 39 derivatives of the biphytanes,<br />
and C 31 –C 35 extended hopanes. Biphytane and<br />
extended hopanes are also found in highpressure<br />
catalytic hydrogenation products released<br />
from solvent-extracted sediments, indicating<br />
that archaea and bacteria were present<br />
in Late Archean sedimentary environments.<br />
Postdepositional, hydrothermal gold mineralization<br />
and graphite precipitation occurred before<br />
metamorphism (2,665 Ma). Late Archean<br />
metamorphism significantly reduced the kerogen's<br />
adsorptive capacity and severely restricted<br />
sediment porosity, limiting the potential<br />
for post-Archean additions of organic matter<br />
to the samples. Argillites exposed to hydrothermal<br />
gold mineralization have disproportionately<br />
high concentrations of extractable<br />
archaeal and bacterial lipids relative to what is<br />
releasable from their respective high-pressure<br />
catalytic hydrogenation product and what is<br />
observed for argillites deposited away from<br />
these hydrothermal settings. The addition of<br />
these lipids to the sediments likely results<br />
from a Late Archean subsurface hydrothermal<br />
biosphere of archaea and bacteria.<br />
2008010046<br />
浙 江 长 兴 更 新 世 红 土 中 的 分 子 化 石 及 其 古<br />
环 境 意 义 = Molecular fossils as indicators for<br />
paleoenvironment from quaternary red earth in<br />
Changxing, Zhejiang. ( 中 文 ). 王 志 远 ; 喻 建 华 ;<br />
顾 延 生 ; 吕 春 英 ; 易 轶 ; 谢 树 成 . 海 洋 地 质 与 第<br />
四 纪 地 质 , 2002, 22(1): 97-102<br />
利 用 GC/MS 从 浙 江 长 兴 更 新 世 红 土 中 检<br />
测 出 种 类 繁 多 但 含 量 甚 微 的 分 子 化 石 , 主<br />
要 包 括 正 构 烷 烃 、 长 链 三 环 萜 、 五 环 三<br />
萜 、 一 元 正 脂 肪 酸 、 正 脂 肪 醇 、 正 烷 基 -2-<br />
酮 等 系 列 。 红 土 中 的 这 些 分 子 化 石 , 特 别<br />
是 正 构 烷 烃 的 特 征 表 明 本 区 的 红 土 是 在 多<br />
水 的 环 境 下 形 成 的 , 并 且 其 上 发 育 了 以 草<br />
本 植 物 为 主 的 高 等 植 被 。 三 环 萜 烷 与 三 萜<br />
烷 比 值 (C 23 /C 30 ) 随 地 层 的 变 化 与 红 土 网<br />
纹 化 程 度 密 切 相 关 , 可 能 具 有 潜 在 的 古 气<br />
候 指 示 意 义 。<br />
2008010047<br />
从 叶 绿 素 trnL-F 和 rps4-trnS 序 列 推 断 中<br />
国 和 大 洋 洲 Polystichum 羊 齿 属 的 系 统 发<br />
育 及 生 物 地 理 意 义 = Phylogeny and biogeography<br />
of Chinese and Australasian Polystichum<br />
ferns as inferred from chloroplast trnL-<br />
F and rps4-trnS sequence data. ( 英 文 ). Li<br />
Chun-Xiang ; Lu Shu-Gang ; Yang Qun. palaeoworld,<br />
2007, 16(4): 294-300<br />
Polystichum, one of the largest genera of<br />
ferns, occurs worldwide with the greatest diversity<br />
in southwest China and adjacent regions.<br />
Although there have been studies of<br />
Chinese Polystichum on its traditional classification,<br />
geographic distributions, and even a<br />
few on its molecular systematics, its relationships<br />
to other species outside China remain<br />
little known. Here, we investigated the phylogeny<br />
and biogeography of the Polystichum<br />
species from China and Australasia. The evolutionary<br />
relationships among 42 Polystichum<br />
species found in China (29 taxa) and Australasia<br />
(13 taxa) were inferred from phylogenetic<br />
analyses of two chloroplast DNA sequence<br />
data sets: rps4-trnS and trnL-F intergenic<br />
spacers. The divergence time between Chinese<br />
and Australasian Polystichum was estimated.<br />
The results indicated that the Australasian<br />
species comprise a monophyletic group that is<br />
nested within the Chinese diversity, and that<br />
the New Zealand species are likewise a monophyletic<br />
group nested within the Australasian<br />
species. The divergence time estimates suggested<br />
that Chinese Polystichum migrated into<br />
Australasia from around 40 Ma ago, and from<br />
there to New Zealand from about 14 Ma. The<br />
diversification of the New Zealand Polystichum<br />
species began about 10 Ma. These results<br />
indicated that Polystichum probably<br />
originated in eastern Asia and migrated into<br />
Australasia: first into Australia and then into<br />
New Zealand.<br />
2008010048<br />
早 期 后 生 动 物 的 种 系 年 代 学 : 分 子 与 化 石<br />
资 料 的 联 合 证 据 = Phylochronology of early<br />
metazoans: combined evidence from molecular<br />
and fossil data. ( 英 文 ). Yang Qun;Ma<br />
Junye; Sun Xiaoyan; Cong Peiyun. Geological<br />
Journal, 2007, 42(3-4): 281 - 295<br />
Timing the evolutionary appearances of<br />
early Metazoa on Earth may rely on the combined<br />
information of fossil occurrences, molecular<br />
divergences and the geological background.<br />
Recent advances in the studies of<br />
Neoproterozoic and earliest Cambrian strata in<br />
14
Change language