DOLOMITES - Annexes 2-8 - Provincia di Udine

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NOMINATION OF THE DOLOMITES FOR INSCRIPTION ON THE WORLD NATURAL HERITAGE LIST UNESCO 48 the Upper ladinian magmatic Event Around 230 million years ago a wide area that currently forms a part of the Mediterranean basin was subjected to significant tectonic movements, the origins of which are not yet clear, caused the opening of cracks and fissures that were intruded by magma. Through these volcanic dikes a great quantity of magma was able to rise to the surface where it remained as volcanic basalt rocks. In some cases the lava emission took place through cracks of limited dimensions while in other cases it took on the form of true volcanic edifices that grew until they emerged above the water. Hypothetical geologic cross-section of the Western Dolomites during Upper Ladinian. A volcanic edifice, comparable in size with actual Vesuvio, was emerging from the water in the Marmolada/Monzoni area and it was rimmed by a series of small reefs, the so called fringing reefs. On the bottom of the sea, covered by a large amount of lavas, hialoclastites and other submarine volcanic products, was laying, within the caldera collapsed, the pre-volcanic sedimentary succession, dismembered and contorted. BSS – metamorphic basement; CPG – Ponte Gardena Conglomerate; Vp – quartziferous porphyries; GAR – Val Gardena Sandstone; BEL – Bellerophon Fm.; WER – Werfen Fm.; CTR – Contrin Fm.; BHL – Buchenstein Fm.; SCI – Sciliar Dolomite; IMFa – M. Fernazza Fm, chaotic megabreccias and polygenic breccias; IMF – M. Fernazza Fm, hialoclastites; V – vulcanites in general. (Modified from Bosellini, 1996). In present-day western Dolomites an ancient volcano was situated in the area of Predazzo (Mt. Mulat) and in Val S. Nicolò, a lateral valley to the left of Val di Fassa. These volcanic buildups are no longer visible today because they collapsed under their own weight (Predazzo) or they were broken down by erosion (Val S. Nicolò). The unstable Mediterranean basin was caused due to telluric movements and covered by layers of lava or volcaniclastic sediments, as in Val Duron, Molignon, and Cernera, the carbonate platforms were affected by submarine landslides of enormous proportions, in the area of which these volcanic products mixed with the platform carbonates and went on to form gigantic accumulations of heterogeneous and heterometric materials (Brandner et alii, 1991; Yose, 1991). In the meantime the massive loads of lava escaped from underground, rising through dikes that drew the magma from buried chambers (magmatic chambers). Alpine orogenesis and consequential erosion have brought these rocks to the light and allowed them to be observed. These rocks solidified slowly, at depth and because of this they are intrusive or plutonic. For this reason one can identify rocks that are granite in type (monzonite, syenite, tourmaliniferous granite, monzo-gabbro, gabbro) embedded in the sedimentary succession. The rocks in contact with the plutonic mass during the slow cooling were metamorphosed and formed a sort of ‘aureole’ that surrounds the two important volcanic constructions rich in peculiar minerals that make famous the Val di Fassa. This complex succession of events and of paleoenvironments is documented in the rocks of the Dolomites, particularly in the Fernazza Formation (synvolcanic phase) and in the powerful volcanic successions of the western Dolomites.
NOMINATION OF THE DOLOMITES FOR INSCRIPTION ON THE WORLD NATURAL HERITAGE LIST UNESCO 49 Geologic and morphologic evolution of the dolomitic groups of the Fassa Valley and surrounding valleys. A. The “reefs” laterally spread out on the nearby marine basins. B. Suddenly a volcanic event buried the “reef” with abundant lavas and volcanic products which fossilised the original morphologic profile of the reefs and their slopes. C. The recent quaternary erosion exhumed those old forms, today spectacularly visible in many parts of the region. (Modified from Bosellini, 1996). Volcanic Dikes intruding the Sciliar Dolomite
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ANNEX 3 A3.1 LETTERS OF SUPPORT
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Systems: 1. Pelmo - Nuvolau 2. Marm
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visitors NOMINATION OF THE DOLOMITE
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others (malghe, alberghi, ristorant
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mountain cabins others (malghe, alb
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visitors footpath NOMINATION OF THE
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ANNEX 5 A5.1 PROTECTIVE DESIGNATION
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11. NOMINATION OF THE DOLOMITES FOR
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49. 50. 51. NOMINATION OF THE DOLOM
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ANNEX 7 A7.1 DVD (PHOTOGRAPHS) A7.2
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159 160- 161 NOMINATION OF THE DOLO
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fauna NOMINATION OF THE DOLOMITES F
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ANNEX 8 A8.1 OTHER LOCAL AUTHORITIE
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DOLOMITES - Annexes 2-8 - Provincia di Udine

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