地质论评
地質論評
지질론평
GEOLOGICAL REVIEW
2015年
1期
1-22
,共22页
汪正江%王剑%江新胜%孙海清%高天山%陈建书%邱艳生%杜秋定%邓奇%杨菲
汪正江%王劍%江新勝%孫海清%高天山%陳建書%邱豔生%杜鞦定%鄧奇%楊菲
왕정강%왕검%강신성%손해청%고천산%진건서%구염생%두추정%산기%양비
扬子陆块%新元古代%南华系%裂谷充填%南华大冰期%沉积序列
颺子陸塊%新元古代%南華繫%裂穀充填%南華大冰期%沉積序列
양자륙괴%신원고대%남화계%렬곡충전%남화대빙기%침적서렬
Yangtze Block%Neoproterozoic%Nanhua System%rifting basin%Nanhua Glacial Period%sedimentary sequence
华南扬子地区发育有新元古代完整的沉积地层记录，是研究我国新元古代时期古大陆演化与沉积盆地演替的天然平台。四堡—晋宁造山运动（约850～820Ma）以前，新元古代早期的扬子陆块总体上处于弧陆碰撞与弧后前陆盆地充填阶段。约820Ma以后，新生裂谷盆地开启了新一轮板块构造旋回，至约635Ma，华南扬子陆块走过了一段冰与火的不平坦里程。板溪群沉积期（约820～720Ma），在Rodinia超大陆裂解的构造背景下，伴随着三幕重要的火山岩浆事件，沉积了一套裂谷盆地充填序列。板溪晚期，由于Rodinia超大陆主要陆块的裂离（Drifting），伴随着区域性海平面下降，迎来了南华大冰期的长安冰期沉积；实际上，南华大冰期并非严格的“雪球地球”，而且期间还存在一个间冰期（富禄间冰期）；随后，可能与海平面持续的海侵上超有关，南沱冰期沉积区域展布广泛。由此可见，华南扬子地区晋宁—四堡造山后至南华冰期，沉积序列、事件序列特征明显，阶段性清楚，为新元古代地层划分对比提供了基础条件。
華南颺子地區髮育有新元古代完整的沉積地層記錄，是研究我國新元古代時期古大陸縯化與沉積盆地縯替的天然平檯。四堡—晉寧造山運動（約850～820Ma）以前，新元古代早期的颺子陸塊總體上處于弧陸踫撞與弧後前陸盆地充填階段。約820Ma以後，新生裂穀盆地開啟瞭新一輪闆塊構造鏇迴，至約635Ma，華南颺子陸塊走過瞭一段冰與火的不平坦裏程。闆溪群沉積期（約820～720Ma），在Rodinia超大陸裂解的構造揹景下，伴隨著三幕重要的火山巖漿事件，沉積瞭一套裂穀盆地充填序列。闆溪晚期，由于Rodinia超大陸主要陸塊的裂離（Drifting），伴隨著區域性海平麵下降，迎來瞭南華大冰期的長安冰期沉積；實際上，南華大冰期併非嚴格的“雪毬地毬”，而且期間還存在一箇間冰期（富祿間冰期）；隨後，可能與海平麵持續的海侵上超有關，南沱冰期沉積區域展佈廣汎。由此可見，華南颺子地區晉寧—四堡造山後至南華冰期，沉積序列、事件序列特徵明顯，階段性清楚，為新元古代地層劃分對比提供瞭基礎條件。
화남양자지구발육유신원고대완정적침적지층기록，시연구아국신원고대시기고대륙연화여침적분지연체적천연평태。사보—진저조산운동（약850～820Ma）이전，신원고대조기적양자륙괴총체상처우호륙팽당여호후전륙분지충전계단。약820Ma이후，신생렬곡분지개계료신일륜판괴구조선회，지약635Ma，화남양자륙괴주과료일단빙여화적불평탄리정。판계군침적기（약820～720Ma），재Rodinia초대륙렬해적구조배경하，반수착삼막중요적화산암장사건，침적료일투렬곡분지충전서렬。판계만기，유우Rodinia초대륙주요륙괴적렬리（Drifting），반수착구역성해평면하강，영래료남화대빙기적장안빙기침적；실제상，남화대빙기병비엄격적“설구지구”，이차기간환존재일개간빙기（부록간빙기）；수후，가능여해평면지속적해침상초유관，남타빙기침적구역전포엄범。유차가견，화남양자지구진저—사보조산후지남화빙기，침적서렬、사건서렬특정명현，계단성청초，위신원고대지층화분대비제공료기출조건。
Yangtze Block,developed with a tact Neoproterozoic depositional record,provides a natural platform to study Neoproterozoic paleo-continent and sedimentary basin evolution.Before the Jinning—Sibao Orogeney from ca.850Ma to ca.820Ma,Yangtze Block had experienced arc—continent collision and arc—back basin filling during early Neoproterozoic.After the Orogeny,new-born rifting basin onset a new tectonic cycle,and toword the end of Nantuo glacial epoch (ca.635 Ma),South China had undergone an uneven journey from intensively volcanic activity to severely cold winter.During Banxi Period,accompanied by Rodinia Supercontinent breakup,a rifting basin depositional sequence had developed in Yangtze Block,and alternating with tree episodes magmatic—volcanic activity.At the end of Banxi Period,main blocks of Rodinia drifting away from each other,maybe,resulted into the beginning of Nanhua Great Glacial Period (NGGP)and globally falling of sea level.In fact,NGGP was not a true“Snowball Earth”,some intervals (such as Fulu Interval)developed.The deposition of Nantuo Glacial Epoch developed widely,which could be related to the continuously ascending of sea level.Therefore,the sequences of deposition and key events during Neoproterozoic were clear,and its stages were also obvious,these characteristics provide a nice condition for the Neoproterozoic stratigraphic division and correlation of Yangtze Block,South China.
