Three important conclusions are as follows:(1) the H2O content in garnet and omphacite can be up to 2000ppm and 3000ppm by weight respectively, indicating that they are significant carrier recycing surficial water into deep earth;(2) the heterogeneous distribution at the small scale of the H2O content and hydrogen isotopic ratios suggest that the whole subduction- exhumation process should be very fast;(3) the regular decrease of H2O content from rim to core within some garnet and omphacite grains indicates that hydrogen diffused out from mineral lattice during exhumation in response to sharp pressure decrease, and such hydrogen is expected to be involved in the early-stage retrograde metamorphism.

取得的主要科學(xué)認(rèn)識(shí)包括：(1)石榴石和綠輝石的結(jié)構(gòu)水含量可以分別高至2000ppm和3000ppm，這表明它們是板塊俯沖過(guò)程中將地表水?dāng)y帶進(jìn)地球深部的重要載體91精品剧情在线观看；(2)水含量和氫同位素組成表現(xiàn)出小尺度的不均一分布妓女播放器，說(shuō)明板塊的俯沖和折返過(guò)程是十分快速的；(3)在板塊折返的早期激情在线图片小说视频，由于壓力的降低人人妻人人干白浆，礦物中的H 會(huì)發(fā)生不同程度和尺度的擴(kuò)散，這是早期退變質(zhì)流體的重要來(lái)源。

Several main results on the evolutions of the life and environment on early earth are summarized as follows:(1) the oxygenation of surface environment didn''t cease until a stable stage for 0.4Ga appeared after 1.6Ga;(2) compared to the isotopic compositions of kerogens and coexisted carbonates, the differences between two can effectively carrier the signals from local environments and bio-assemblages;(3) multiple isotopic relationships between kerogens and individual alkanes in Proterozoic samples were observed, which would depend on the specific biogeochemical processes;(4) repeated biogeochemical changes were observed accompanying Neoproerozoic glaciations, which suggesting that environmental rather than evolutionary forces were driving the biogeochemical changes;(5) the bio-radiations after Neoproterozoic glaciations were definitely suggested by molecular and isotopic data to be at the early Cambrian and after the middle of Doushantuo deposition with different triggers for them.

研究獲得以下重要認(rèn)識(shí)：（1）古元古代地表環(huán)境的氧化可能一直持續(xù)到中元古代早期(約1.6Ga)日本欧美自拍主播偷拍，而在此之后的4億年里則保持相對(duì)穩(wěn)定一区二区毛片网站；（2）相對(duì)于傳統(tǒng)的干酪根和碳酸鹽的碳同位素組成，二者之差則能更好反映區(qū)域環(huán)境的演化特征国产精品自拍三区；（3）在元古代干酪根與單體烷烴類(lèi)之間存在多種碳同位素組成關(guān)系在线亚洲综合日本；而其與不同的生物地球化學(xué)過(guò)程有關(guān)；（4）全球海洋生物地球化學(xué)特征隨新元古代多次冰期出現(xiàn)循環(huán)波動(dòng)日韩黄网站高清观看，這顯然為環(huán)境因子的驅(qū)動(dòng)亚洲色图欧美色图国产一区；（5）在新元古代大冰期之后，分子與同位素?cái)?shù)據(jù)顯示地球生命在陡山沱中后期和早前寒武紀(jì)出現(xiàn)兩次大輻射国产又黄又刺激视频在线，然而兩次生命輻射的本質(zhì)卻是不同的。