| 270 | 6 | 16 |
| 下载次数 | 被引频次 | 阅读次数 |
结合珊瑚骨骼X射线照片和δ18O、δ13C的年际变化,对南沙群岛美济礁滨珊瑚骨骼岩心的密度条带进行了分析,发现其密度带变化模式多样,初步可归纳为如下3种类型:(1)宽度相近的高低密度条纹均匀、相间地排列,一对高低密度条带平均宽约4 mm;(2)在骨骼主生长轴上由近于均匀分布的细密度条带组成,高低密度条带对平均宽约4 mm,但在主生长轴的两侧,多条细密度条带合成一条较宽的密度条带,高低密度条带对平均宽约10mm;(3)主生长轴上和其两侧的骨骼密度条带均由细密度条带组成,合成的高低密度条带宽分别约7和4 mm。与滨珊瑚骨骼δ18O的对比分析表明,第1种类型的细密度条带对不代表骨骼一年的伸长量,因为高低密度带和δ18O的峰值和谷值之间不存在统计学上的关系。第2种和第3种类型中由细条带组成的宽的高低密度条带对很可能是年周期性的。
Abstract：The characteristics of density bands of Porites coral from Meiji reef in Nansha area are revealed by X-radiography of coral slabs and periodical changes of δ18O and δ13C in the skeletons.There are three typical patterns among varied density bands of both core MJO2 and core MJO3:(1) high-density bands and low-density bands with nearly equal widths were alternately arranged,and the width of the density band pair is about 4 mm;(2) fine density bands were alternately arranged with nearly equal widths(about 4 mm width of the density band pair) on the axis of maximum growth,while multiple fine density bands merged into one high or low density band beside the growth axis with 10 mm width of the compositive density band pair;(3) the density bands both on the axis of maximum growth and beside the axis are composed of fine density bands with 7 mm width high density band and 4 mm width low density band.The variations of δ18O of core MJO3 show that the density-band arrangement in the first pattern had no annual cycles since both high and low density bands ware not related to δ18O peak or trough values.But a couple of high and low wider density bands comprising fine densities seems to be annual.
[1]Knutson D W,Buddemeier R W,Smith S V.Coral chronome-ters:seasonal growth bands in reef corals[J].Science,1972,177:270-272.
[2]Buddemeier R W,Maragos J E,Knutson D W.Radiographicstudies of reef coral exoskeletons:rates and patterns of coralgrowth[J].Journal of Experi mental Marine Biology and Ecol-ogy,1974,14:179-200.
[3]Weber J N,Deines P,White E W,et al.Seasonal high andlow density bands in reef coral skeletons[J].Nature,1975,255:697-698.
[4]Isdale P.Fluorescent bands in massive corals record centuriesof coastal rainfall[J].Nature,1984,310:578-579.
[5]Patzold J.Growth rhythms recorded in stable isotopes anddensity bands in the reef coral Porites lobata(Cebu,Philip-pines)[J].Coral Reefs,1984,3:87-90.
[6]Felis T,Patzold J,Loya Y,et al.Acoral oxygenisotope recordfromthe northern Red Sea documenting NAO,ENSO,and NorthPacific teleconnections on Middle East cli mate variability since theyear 1750[J].Paleoceanography,2000,15:679-694.
[7]Wellinggton G M,Glynn P W.Environmental influences onskeletal banding in Pacific(Panam)reef corals[J].CoralReefs,1983,1:215-222.
[8]Wang C,Huang C.Oxygen and carbon isotope records in thecoral Favia speciosa of Nanwan Bay,southern Tai wan[J].Ac-ta Oceanographica Tai wanica,1987,18:150-157.
[9]Fairbanks R G,Dodge R E.Annual periodicity of the skeletaloxygen and carbon stable isotopic composition in the coralMontastrea Annularis[J].Geochi mica et Cosmochi mica Acta,1979,43:1009-1020.
[10]余克服,黄耀生,陈特固,等.雷州半岛造礁珊瑚Porites lut-ea月分辨率的δ18O温度计研究[J].第四纪研究,1999,19(1):67-72.[YU Ke-fu,HUANG Yao-sheng,CHEN Te-gu,et al.A monthly resolutionδ18O thermometer of aPoritesluteacoral from Leizhou penisula[J].Quaternary science,1999,19(1):67-72.]
[11]Kuhnert H,Patzold J,Hatcher B,et al.A 200-year coralstable oxygen isotope record from a high-latitude reef offWestern Australia[J].Coral Reefs,1999,18:1-12.
[12]Suzuki A,Gagan M K,Fabricius K,et al.Skeletal isotopemicroprofiles of growth perturbations inPoritescorals duringthe 1997-1998 mass bleaching event[J].Coral Reefs,2003,22:357-369.
[13]Mitsuguchi T,Matsumoto E,Uchida T.Mg/Ca and Sr/Caratios ofPoritescoral skeleton:evaluation of the effect ofskeletal growth rate[J].Coral Reefs,2003,22:381-388.
[14]Brown B,Tissier M L,Howard L S.et al.Asynchronousdeposition of dense skeletal bandsinPoriteslutea[J].MarineBiology,1986,93:83-89
[15]Aharon P.Recorders of reef environment histories:Stable i-sotopes in corals,giant clams,and calcareous algae[J].CoralReefs,1991,10:71-90.
[16]Buddemeier R W,Kinzie III R A.The Chronometric Relia-bility of Contemporary Corals[A].Growth Rhythms and theHistory of the Earth’s Rotation[C].New York:John Wileyand Sons,1975,135-147.
[17]Buddemeier R W.Environmental controls over annual and lunarmonthly cycles in hermatypic coral calcification[C]//Proceedingsof the SecondInternational Symposiumon Coral Reefs.Brisbane:Great Barrier Reef Committee,1974:259-267.
[18]余克服,陈特固,黄鼎成,等.中国南沙群岛滨珊瑚δ18O的高分辨率气候记录[J].科学通报,2001,46(14):1 199-1 204.[YU Ke-fu,CHEN Te-gu,HUANG Ding-cheng Thehigh-resolution cli mate recorded in theδ18O ofPorites luteafromthe Nansha Islands of China[J].Chinese Science Bulle-tin,2001,46(14):1 199-1 204.]
[19]Yu K F.U-series dating of dead[J].Porites corals in theSouth China Sea:Evidence for episodic coral mortality overthe past two centuries[J].Quaternary Geochronology,2006,1(2):129-141.
[20]Grottoli A G,Rodrigues L J,Matthews K A,et al.Pre-treat ment effects on coral skeletalδ13Candδ18O[J].ChemicalGeology,2005,221:225-242.
[21]Barnes DJ,Lough J M.The nature of skeletal density ban-ding in scleractinian corals:fine banding and seasonal pat-terns[J].Journal of Experi mental Marine Biology and Ecolo-gy,1989,126:119-34.
[22]Tian J,Wang P,Cheng X,et al.Astronomically tuned Plio-Pleistocene benthicδ18OrecordfromSouth China Sea and At-lantic-Pacific comparison[J].Earth and Planetary ScienceLetters,2002,203:1015-1029.
[23]McConnaughey T.13Cand18Oisotopic disequilibriumin bio-logical carbonates:I.Patterns[J].Geochi mica et Cosmo-chi mica Acta,1989,53:151-162.
基本信息:
DOI：10.16562/j.cnki.0256-1492.2007.04.013
中图分类号:Q911
引用信息:
[1]张江勇,余克服,成鑫荣,等.南沙美济礁滨珊瑚骨骼密度条带的变化[J].海洋地质与第四纪地质,2007,No.108(04):85-90.DOI:10.16562/j.cnki.0256-1492.2007.04.013.
基金信息:
中国科学院知识创新工程重要方向性项目(KZCX-YW-318); 国家科技支撑计划“十一五”“南沙群岛及其邻近海区综合研究”
2007-08-28
2007-08-28