Insights on the thermal evolution of the Ligurian Apennines (Italy) through fission-track analysis
Insights on the thermal evolution of the Ligurian Apennines (Italy) through fission-track analysis
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通过裂变径迹分析洞察利古里亚亚平宁山脉（意大利）的热演化
DOI：
10.1144/gsjgs.153.3.0419
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发表时间：
1996
影响因子：
2.7
通讯作者：
G. Bigazzi
中科院分区：
文献类型：
--
作者：
M. Balestrieri;E. Abbate;G. Bigazzi
对北方亚平宁山脉推覆体上部几何单元（内利古里亚期和外利古里亚期）的24个样品进行了磷灰石裂变径迹分析。年龄在C。20 Ma和c.六马。两个样品还用锆石裂变径迹测年（c。155、C。199 Ma）。这些数据表明，在晚白垩世后的压缩过程中，内利古里亚岩达到了磷灰石裂变径迹完全退火的温度（T>c）。120 °C），但不是在锆石（T<c。300°C）的温度。始新世大陆碰撞后，这些岩石被冷却（低于c。120°C），并再次开始在磷灰石中保留裂变径迹。自渐新世以来，在表缝合沉积物下的进一步埋藏引起了部分到全部磷灰石裂变径迹退火。在最后一个折返阶段，沉积物覆盖层被移走。这一折返作用可能与晚中新世伸展构造有关，始于公元前200年。8-9马在中部和南部的研究区。
Apatite fission-track analysis has been applied on 24 samples from the geometrically upper units (Internal and External Ligurids) of the Northern Apennines nappe pile. They yield ages between c. 20 Ma and c. 6 Ma. Two samples were also dated with fission tracks in zircon (ages of c. 155 Ma and c. 199 Ma). Together the data reveal that during post-Late Cretaceous compression the Internal Ligurids reached temperatures to completely anneal fission tracks in apatite (T>c. 120 °C) but not in zircon (T<c. 300°C). After Eoccne continental collision these rocks were cooled (below c. 120°C) and started again to retain fission tracks in apatite. Since the Oligocene a further burial under episutural sediments ensued that caused a partial to total apatite fission-track annealing. During a final phase of cxhumation the sedimentary cover was removed. This exhumation can be linked to Late Miocenc extensional tectonics, that started at c. 8–9 Ma in the central and southern portions of the study area.