| 单词 | caldera |
| 释义 | caldera noun[C] geologyspecializeduk/kælˈdeə.rə/us/kælˈder.ə/a verylarge,circularhollowthatremainswhen thecentralpartof avolcanofallsin after aneruption 喷火山口（火山爆发后，中心塌陷而形成的巨大中空） Photography by Mangiwau/Moment/GettyImages Geography: hills & mountains
Examplesofcalderacaldera A small, possibly ephemeralcalderalake is a likely source. From theCambridge English Corpus Cooling units and composite sheets in relation tocalderastructure. From theCambridge English Corpus Eruption of the ignimbrites is envisaged as a series of poorly expanded flows possibly with incorporated fall material generated by foundering of acalderafloor. From theCambridge English Corpus The sedimentary breccias were probably formed from talus and/or other types of colluvium that were shed from the ring-fracture fault scarp of thecaldera. From theCambridge English Corpus These minerals may have formed by recrystallization of pre-existing weak advanced-argillic alteration at the southern margin of thecalderastructure. From theCambridge English Corpus This suggests that eruptive hiatuses in the extracaldera record may reflect effusive activity and stratovolcano or shield-building phases within the summitcaldera. From theCambridge English Corpus Acalderalake is occasionally established in the presentcalderafollowing snowmelt. From theCambridge English Corpus It is possible that this embayment is acalderaor lateral collapse structure. From theCambridge English Corpus This northerncalderawas formed in the 21 000 year explosive eruption. From theCambridge English Corpus This igneous activity was focused on the southwest margin of the dormantcaldera. From theCambridge English Corpus Fractionation was repeatedly interrupted by eruption of material from the roof zone such that seven stages ofcalderadevelopment have been identified. From theCambridge English Corpus They have been interpreted to represent part of acaldera-related succession, possibly intra-caldera. From theCambridge English Corpus Thecalderahas chemical characteristics that could result in ambiguous or incorrect tectonic discrimination if the entire rock suite was not considered as a whole. From theCambridge English Corpus Many of the major eruptions recorded by the extensive lithic brecciabearing ignimbrite sheets may have involvedcalderacollapse. From theCambridge English Corpus Thecalderais partially filled and surrounded by crystal-rich ignimbrite (f). From theCambridge English Corpus These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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