川东地区飞一段震积岩的发现及识别标志
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摘要
川东华蓥山断裂带附近飞仙关组一段发育大量同生变形构造。通过野外剖面和岩心观察分析,认为液化岩脉、重力断层、刺穿层理、肠状构造、火焰构造及卷曲变形构造等同生变形构造为震积成因。震积作用沉积可分为原地震积岩(A)、震积—海啸岩(B)和背景沉积(C)三个单元,其中A单元包括液化碳酸盐岩脉(a)、震褶岩(b)、震裂岩(c),发育a-b-c(A1)和b-c(A2)两种组合。飞一段各震积单元组成A1-B-A2-C沉积序列。结合对区域构造背景的分析,认为震积岩的发育与华蓥山断裂带的阶段性活动有关,华蓥山断裂带强烈活动诱发地震是飞一段震积岩形成的动力机制。
Syndepositional deformation structures were well developed in the Fei 1 Member nearby the Hua Yingshan fracture belt in the eastern Sichuan Basin.Based on studies of regional tectonic setting and observation of geologic cross-sections and drilling cores,it is concluded that these structures,such as liquefied vein,gravity fault,bedding phenomenon,enterolithic structure,flamme structure,convolute beddings were mainly produced by seismic liquefaction.According to recognition marks and combination characteristics,seismic sedimentary process can be divided into autochthonous seismite(A),tsunamite(B)and background deposit(C)units,of which unit A consist of liquefied vein(a),seismic corrugated rock(b)and shattering rock,which are associated into two types of associations:a-b-c(A1)and b-c(A2).The sedimentary sequence of seismite of the Fei 1 Member in the eastern Sichuan Basin is A1-B-A2-C.Combining with the cognizance of regional tectonic setting,it indicates that the seismite is in connection with the Hua Yingshan fracture belt,and the seismic activities due to the activities of the Hua Yingshan fracture belt provided dynamics for the developing of seismite of the Fei 1 Member in the eastern Sichuan Basin.
Syndepositional deformation structures were well developed in the Fei 1 Member nearby the Hua Yingshan fracture belt in the eastern Sichuan Basin.Based on studies of regional tectonic setting and observation of geologic cross-sections and drilling cores,it is concluded that these structures,such as liquefied vein,gravity fault,bedding phenomenon,enterolithic structure,flamme structure,convolute beddings were mainly produced by seismic liquefaction.According to recognition marks and combination characteristics,seismic sedimentary process can be divided into autochthonous seismite(A),tsunamite(B)and background deposit(C)units,of which unit A consist of liquefied vein(a),seismic corrugated rock(b)and shattering rock,which are associated into two types of associations:a-b-c(A1)and b-c(A2).The sedimentary sequence of seismite of the Fei 1 Member in the eastern Sichuan Basin is A1-B-A2-C.Combining with the cognizance of regional tectonic setting,it indicates that the seismite is in connection with the Hua Yingshan fracture belt,and the seismic activities due to the activities of the Hua Yingshan fracture belt provided dynamics for the developing of seismite of the Fei 1 Member in the eastern Sichuan Basin.
引文
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14陈世悦,袁文芳,鄢继华.济阳坳陷早第三纪震积岩的发现及其意义[J].地质科学,2003,38(3):377-386
15夏青松,田景春.鄂尔多斯盆地南部上三叠统延长组震积岩的发现及地质意义[J].沉积学报,2007,25(2):246-252
16李元昊,刘池洋,王秀娟.鄂尔多斯盆地三叠系延长组震积岩特征研究[J].沉积学报,2008,25(5):772-779
17童崇光.四川盆地断褶构造形成机制[J].天然气工业,1992,12(5):1-6
18梁定益,聂泽同,宋志敏.再论震积岩及震积不整合——以川西、滇西地区为例[J].地球科学,1994,19(6):845-850
19田洪水,张增奇.山东安丘地区郯庐断裂带古近纪冲积物震积岩序列[J].地质科学,2006,41(2):208-216
2Heezen B C,Dyke C L.Grand bank slump[J].AAPG Bulletin,1964,48(2):221-225
3Mohindra R,Bagati T N.Seismically induced soft-sediment deforma-tion structures(seismites)around Sumdo in the Lower Spitti valley(Tethys Himalaya)[J].Sedimentary Geology,1996,101(1-2):69-83
4Bhattacharya HN,Sandip B.Seismites in a Proterozoic tidal succes-sion,Singhbhum,Bihar India[J].Sedimentary Geology,1998,119(3-4):239-252
5Plaziat J C,Ahmamou M.Mechanic processes active in seismites:their identification and tectonic significance in the Pliocene Basin of the Sais of Fes and Meknes(Morocco)[J].Geodynamic Acta,1998,11(4):183-203
6Shiki T,Cita M B,Gorsline D S.Sedimentary features of seismite,seismo-turbidites and tsunamiites-an introduction[J].Sedimentary Ge-ology,2000,135(1-4):7-9
7宋天锐.北京十三陵前寒武纪碳酸盐岩地层中的一套可能的地震—海啸序列[J].科学通报,1988,38(8):609-611
8乔秀夫,宋天锐,高林志,等.碳酸盐岩振动液化地震序列[J].地质学报,1994,68(1):16-32
9乔秀夫,李海兵,高林志.华北地台震旦纪—早古生代地震节律[J].地学前缘,1997,4(3-4):155-160
10乔秀夫,高林志.华北中新元古代及早中生代地震灾变事件及与Rodinia的关系[J].科学通报,1999,44(16):1753-1758
11乔秀夫,高林志,彭阳,等.古郯庐带沧浪铺阶地震事件、层序及构造意义[J].中国科学:D辑,2001,31(11):911-918
12杜远生,韩欣.论震积作用和震积岩[J].地球科学进展,2000,15(4):389-394
13杜远生,张传恒,韩欣.滇西中元古代昆阳群的地震事件沉积及其地质意义[J].中国科学:D辑,2001,31(4):284-290
14陈世悦,袁文芳,鄢继华.济阳坳陷早第三纪震积岩的发现及其意义[J].地质科学,2003,38(3):377-386
15夏青松,田景春.鄂尔多斯盆地南部上三叠统延长组震积岩的发现及地质意义[J].沉积学报,2007,25(2):246-252
16李元昊,刘池洋,王秀娟.鄂尔多斯盆地三叠系延长组震积岩特征研究[J].沉积学报,2008,25(5):772-779
17童崇光.四川盆地断褶构造形成机制[J].天然气工业,1992,12(5):1-6
18梁定益,聂泽同,宋志敏.再论震积岩及震积不整合——以川西、滇西地区为例[J].地球科学,1994,19(6):845-850
19田洪水,张增奇.山东安丘地区郯庐断裂带古近纪冲积物震积岩序列[J].地质科学,2006,41(2):208-216
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