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首页> 外文期刊>Geochemistry, geophysics, geosystems >Miocene to Holocene Marine Tephrostratigraphy Offshore Northern Central America and Southern Mexico: Pulsed Activity of Known Volcanic Complexes
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Miocene to Holocene Marine Tephrostratigraphy Offshore Northern Central America and Southern Mexico: Pulsed Activity of Known Volcanic Complexes

机译：中央海绵到全新世海洋TeproStratigraphy海上中美洲北部和墨西哥南部：已知火山复合物的脉冲活动

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We studied the tephra inventory of 14 deep sea drill sites of three Deep Sea Drilling Project and Ocean Drilling Program legs drilled offshore Guatemala and El Salvador (Legs 67, 84, and 138) and one leg offshore Mexico (Leg 66). Marine tephra layers reach back from the Miocene to the Holocene. We identified 223 primary ash beds and correlated these between the drill sites, with regions along the volcanic arcs, and to specific eruptions known from land. In total, 24 correlations were established between marine tephra layers and to well-known Quaternary eruptions from El Salvador and Guatemala. Additional 25 tephra layers were correlated between marine sites. Another 108 single ash layers have been assigned to source areas on land resulting in a total of 157 single eruptive events. Tephra layer correlations to independently dated terrestrial deposits provide new time markers and help to improve or confirm age models of the respective drill sites. Applying the respective sedimentation rates derived from the age models, we calculated ages for all marine ash beds. Hence, we also obtained new age estimates for eight known but so far undated large terrestrial eruptions. Furthermore, this enables us to study the temporal evolution of explosive eruptions along the arc, and we discovered five pulses of increased activity: (1) a pulse during the Quaternary, (2) a Pliocene pulse between 6 and 3 Ma, (3) a Late Miocene pulse between 10 and 7 Ma, (4) a Middle Miocene pulse between 17 and 11 Ma, and (5) an Early Miocene pulse (ca. 21 Ma).
机译：我们研究了三个深海钻探项目和海洋钻井计划腿的14个深海钻头部位的Tephra库存钻孔海上危地马拉和萨尔瓦多（腿67,84和138）和一条腿近海墨西哥（腿66）。海洋Tephra层从内科达到全新世。我们确定了223张主灰床，并将这些钻头部位与火山弧的区域相关联，以及从土地中已知的特定喷发。总共在海洋Tephra层之间建立了24个相关性，以及来自萨尔瓦多和危地马拉的着名季爆发。额外的25个Tephra层是相关的海洋部位之间的相关性。另外108个单灰分层已被分配给土地的源区域，导致总共157个爆发事件。 Tephra层相关与独立日期的地面存款提供新的时间标记，并有助于改进或确认各个钻头的年龄模型。应用源自年龄模型的各个沉降率，为所有海洋灰床计算出年龄。因此，我们还获得了八个已知但远远不满的大陆爆发的新时代估计。此外，这使我们能够研究沿弧的爆炸性喷发的时间演变，我们发现了五个增加的活性脉冲：（1）季期期间的脉冲，（2）在6到3 mA之间的全烯脉冲，（3）在10到7 mA之间的晚期脉冲，（4）中间内肾脉脉冲在17至11mA之间，（5）早期的内肾上腺脉冲（约31 ma）。

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