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NOTE ILLUSTRATIVE Della CARTA GEOLOGICA D'italia Alla

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NOTE ILLUSTRATIVE Della CARTA GEOLOGICA D'italia Alla ISPRA Istituto Superiore per la Protezione e la Ricerca Ambientale SERVIZIO GEOLOGICO D’ITALIA Organo cartografico dello Stato (legge 68 del 2.2.1960) NOTE ILLUSTRATIVE della CARTA GEOLOGICA D’ITALIA alla scala 1:50.000 foglio 076 LECCO a cura di M. Gaetani(1), D. Sciunnach(2), A. Bini(1), S. Rossi(3) con contributi di D. Corbari(2,4) (1) Dipartimento di Scienze della Terra, Università di Milano (2) Regione Lombardia (3)PROGETTO Consulente di Regione Lombardia (4) Provincia di Cremona Ente realizzatore CARG Direttore del Servizio Geologico d’Italia - ISPRA: C. Campobasso Responsabile del Progetto CARG per il Servizio Geologico d’Italia - ISPRA: F. Galluzzo Direttori della Direzione Generale competente – Regione Lombardia: R. Compiani, M. Presbitero, M. Rossetti, M. Nova, B. Mori Dirigenti della struttura competente – Regione Lombardia: M. Presbitero, B. Mori, R. Laffi, A. De Luigi Responsabili del Progetto CARG per Regione Lombardia: M. Presbitero, A. Piccin Coordinatore scientifico: A. Gregnanin Per il Servizio Geologico d’Italia – ISPRA: Revisione scientifica: E. Chiarini, L. Martarelli, R.M. Pichezzi Coordinamento cartografico: D. Tacchia (coord.), S. Falcetti Revisione informatizzazione dei dati geologici: L. Battaglini, V. Campo; R.M. Pichezzi (ASC) Coordinamento editoriale ed allestimento per la stampa: D. Tacchia (coord.), S. Falcetti Per Regione Lombardia Coordinamento editoriale e allestimento cartografico: G. B. Siletto, M. Credali Informatizzazione dei dati geologici: coordinamento e direzione lavori: G. B. Siletto informatizzazione: D. Guarneri, S. Minella, S. Racchetti, D. Sciunnach, F. Torri, M. Cetti PROGETTOcollaudo: a cura di Lombardia Informatica S.P.A Allestimento cartografico per la stampa della Banca Dati a cura di Land Technology & Service S.r.L. - Treviso Gestione tecnico-amministrativa del Progetto CARG: M.T. Lettieri (Servizio Geologico d’Italia - ISPRA) G. Mannucci, N. Padovan, A. Piccin, G.B. Siletto, M. Credali (Regione Lombardia) Si ringraziano i compon enti del precedente ComitatoCARG Geologico per il loro contributo scientifico INDICE I - INTRODUZIONE ............................................................... pag 7 II - LETTERATURA E CARTOGRAFIA GEOLOGICHE PRECEDENTI ...................................................................... 11 1. - IL RICONOSCIMENTO INIZIALE .................................... 11 2. - IL CONSOLIDAMENTO DELLE CONOSCENZE ........... 12 3. - LE RICERCHE NEGLI ULTIMI 50 ANNI ......................... 13 3.1 - LE SUCCESSIONI ROCCIOSE ........................................................ 13 3.2 - LE INTERPRETAZIONI STRUTTURALI ............................................ 14 3.3 - I DEPOSITI SUPERFICIALI ............................................................ 16 III - INQUADRAMENTO GEOLOGICO E MORFOLOGICO ..... 19 1. - GEOLOGIA .......................................................................... 19 2. - GEOMORFOLOGIA ........................................................... 22 2.1 - BACINO DEL FIUME ADDA ........................................................ 22 2.1.1. - La valle del Lago di Lecco ................................................... 23 2.1.2. - Il Gruppo delle Grigne ......................................................... 23 2.1.3. - La Valsassina ........................................................................ 24 2.1.4. - Il carsismo del Gruppo delle Grigne, della Valsassina, dei Piani di Bobbio e di Artavaggio ..................................... 25 2.2 - Bacino del Fiume Brembo .................................................... 25 IV - STRATIGRAFIA ................................................................ 27 1. - BASAMENTO CRISTALLINO DELLE ALPI MERIDIONALI ................................................................... 27 1.1 - GNEISS DI MORBEGNO (MOB) ................................................ 27 1.2 - QUARZODIORITE DI VAL BIANDINO (BAN) ............................... 29 1.3 - GRANITO DELLA VALLE SAN BIAGIO (GBI) .............................. 31 2. - SUCCESSIONE SEDIMENTARIA DELLE ALPI PROGETTOMERIDIONALI ................................................................... 32 2.1 - GRUPPO DEI LAGHI GEMELLI .................................................... 32 2.1.1. - Vulcanite del Monte Cabianca (VUC) ................................. 32 2.1.2. - Formazione del Pizzo del Diavolo (FPZ) ............................ 34 2.2 - VERRUCANO LOMBARDO (VER) .............................................. 36 2.3 - SERVINO (SRV) ...................................................................... 38 2.4 - CARNIOLA DI BOVEGNO (BOV) ............................................... 39 2.5 - CALCARE DI ANGOLO (ANG) .................................................. 40 2.6 - CALCARE DI CAMORELLI – LITOFACIES DOLOMITICA (CMRa) ..... 42 2.7 - FORMAZIONE DI BELL ANO (BLCARGN) ............................................ 44 2.8 - CALCARE DI PREZZO (PRZ) .................................................... pag 45 2.9 - CALCARE DI ESINO (ESI) ........................................................ 46 2.10 - FORMAZIONE DI BUCHENSTEIN (BUC) ...................................... 53 2.11 - FORMAZIONE DI WENGEN (WEN) ............................................ 54 2.12 - CALCARE DI PERLEDO-VARENNA (CPV) .................................. 56 2.13 - CALCARE ROSSO (KLR) ......................................................... 57 2.14 - FORMAZIONE DI BRENO (BRE) ................................................ 58 2.15 - CALCARE METALLIFERO BERGAMASCO (CMB) ......................... 59 2.16 - ARENARIA DI VAL SABBIA (SAB) ............................................ 59 2.17 - FORMAZIONE DI GORNO (GOR) .............................................. 62 2.18 - FORMAZIONE DI SAN GIOVANNI BIANCO (SGB) ........................ 64 2.19 - DOLOMIA PRINCIPALE (DPR)................................................... 66 2.20 - GRUPPO DELL’ARALALTA ......................................................... 68 2.20.1. - Dolomie Zonate (DZN) ........................................................ 68 2.20.2. - Calcare di Zorzino (ZOR) ................................................... 70 2.21 - ARGILLITE DI RIVA DI SOLTO (ARS) ......................................... 71 2.22 - CALCARE DI ZU (ZUU) ........................................................... 73 2.23 - FORMAZIONE DELL’ALBENZA (ALZ) ........................................ 75 2.24 - CALCARE DI SEDRINA (SED) ................................................... 76 2.25 - GRUPPO DEL MEDOLO .............................................................. 77 2.25.1. - Calcare di Moltrasio (MOT) ............................................... 78 2.25.2. - Calcare di Domaro (DOM) .................................................. 80 2.26 - CALCARE DI MORBIO (KMO) ................................................. 81 2.27 - ROSSO AMMONITICO LOMBARDO (RAL) .................................. 81 2.28 - FORMAZIONE DI SOGNO (SOG) ................................................ 83 2.29 - SELCIFERO LOMBARDO (SM) ................................................... 84 2.29.1. - Radiolariti del Selcifero Lombardo ...................................... 84 2.29.2. - Rosso ad Aptici ..................................................................... 87 2.30 - MAIOLICA (MAI) ................................................................... 88 2.31 - MARNA DI BRUNTINO (BRU) .................................................. 89 2.32 - SASS DE LA LUNA (SDL) ........................................................ 90 2.33PROGETTO - FORMAZIONE DI SORISOLE (FSE) ............................................. 91 2.34 - GRUPPO DEL CANTO ................................................................ 93 2.34.1. - Formazione di Gavarno (GVR) ........................................... 93 2.34.2. - Flysch di Pontida (PTD) ...................................................... 95 2.35 - ARENARIA DI SARNICO (SAR) ................................................. 98 3. - FILONI E PICCOLE MASSE IGNEE................................. 100 3.1 - Filoni andesitici non foliati (fn) ........................................... 100 4. - SINTESI DEI DATI STRATIGRAFICI: IL DIAGRAMMA DI GEOHISTORY ................................. 100 5. - DEPOS ITI NEOGEN ICOCARG - QUATERNARI ....................... 104 5.1 - PREMESSA ............................................................................... pag 104 5.2 - UNITÀ DEL BACINO DELL’ADDA ............................................... 108 5.2.1. - Conglomerato del Zuc del Cant del Brug (ZCB) ................. 108 5.2.2. - Conglomerato di Rialba (RAB) ........................................... 109 5.2.3. - Conglomerato di Ponte della Folla (PFL) ........................... 110 5.2.4. - Conglomerato del Pialeral (IAL) ........................................ 111 5.2.5. - Conglomerato di Ponte della Vittoria (PVT) ....................... 112 5.2.6. - Conglomerato del Pioverna (PVO) ..................................... 113 5.2.7. - Conglomerato della Valle dei Molini (VMI)........................ 114 5.2.8. - Travertino di Necrebbio (NEC) ........................................... 115 5.2.9. - Supersintema della Colma del Piano (CM) ......................... 116 5.2.9.1. - Formazione di Fucine (CFU) ...................................... 117 5.2.9.2. - Altre unità del Supersintema della Colma del Piano 121 5.2.10. - Supersintema dei Laghi ........................................................ 122 5.2.10.1. - Sintema dei Piani Di Bobbio (LBB) ........................
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