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VIMERCATE a Cura Di: R 1 I S P R A Istituto Superiore per la Protezione e la Ricerca Ambientale SERVIZIO GEOLOGICO D’ITALIA Organo Cartografico dello Stato (legge n°68 del 2.2.1960) NOTE ILLUSTRATIVE della CARTA GEOLOGICA D’ITALIA alla scala 1:50.000 foglio 097 VIMERCATE a cura di: R. Bersezio(1), A. Bini(1), R. Gelati(1), C. Ferliga (2), I. Rigamonti (3), A. Strini (1) con contributi di: A. Rovida(4), G.P. Beretta(1), I. Premoli Silva(1), G. Scardia(5), D. Sciunnach(2), F. Torri(3) (1) Dipartimento di Scienze della Terra, Università di Milano (2) Regione Lombardia (3) Consulente di Regione Lombardia (4) INGV - Milano (5) CNR - IDPA - Milano Ente realizzatore: 2 Direttori 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, P.I. Baccolo Dirigenti della struttura competente - Regione Lombardia: M. Presbitero, B. Mori, R. Laffi, A. De Luigi, M. Cassin, N. Padovan, D. Fossati e A. Biancardi Responsabili del Progetto CARG per Regione Lombardia: M. Presbitero, A. Piccin Coordinatore scientifico: A. Gregnanin PER IL SERVIZIO GEOLOGICO D’ITALIA - ISPRA Revisione scientifica: R. M. Pichezzi, E. Chiarini, L. Martarelli Coordinamento cartografico: D. Tacchia (coord.), S. Falcetti Revisione informatizzazione dei dati geologici: L. Battaglini, R. Carta, R. M. Pichezzi (ASC) Coordinamento editoriale ed allestimento per la stampa: D. Tacchia, 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, M. Credali informatizzazione: S. Racchetti, F. Torri, F. Mandozzi, M. Cetti, G. Tucci collaudo: a cura di Lombardia Informatica S.P.A Allestimento cartografico per la stampa della Banca Dati a cura di 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 e P. Belotti (Regione Lombardia) Si ringraziano i componenti del precedente Comitato Geologico per il loro contributo scientifico 3 I. INTRODUZIONE .......................................................................................................... 7 1. - CRITERI ADOTTATI ........................................................................... 9 1.1 – UNITÀ DISTINTE IN BASE AL BACINO DI APPARTENENZA ...................................... 9 1.2 – UNITÀ NON DISTINTE IN BASE AL BACINO DI APPARTENENZA ............................. 11 II. STUDI PRECEDENTI ................................................................................................ 15 1. - CARTOGRAFIA GEOLOGICA ......................................................... 15 2. - LETTERATURA PRECEDENTE ....................................................... 17 III. INQUADRAMENTO GEOLOGICO ......................................................................... 27 1. - QUADRO GEOLOGICO E STRUTTURALE .................................... 27 2. - DATI DI SOTTOSUOLO .................................................................... 36 3. - SISMICITÀ E CENNI DI NEOTETTONICA ..................................... 41 IV. CARATTERI GEOMORFOLOGICI ........................................................................ 43 V. STRATIGRAFIA ......................................................................................................... 49 1. - LA SUCCESSIONE MESOZOICA PRE-RIFT............................................................ 49 1.1 - DOLOMIA PRINCIPALE (DPR) ........................................................................... 49 1.2 - GRUPPO DELL‟ARALALTA ................................................................................. 50 1.2.1. - Dolomie zonate (DZN) ................................................................................ 51 1.2.2. - Calcare di Zorzino (ZOR) .......................................................................... 51 1.3 - ARGILLITE DI RIVA DI SOLTO (ARS) ................................................................ 52 1.4 - CALCARE DI ZU (ZUU) .................................................................................... 56 1.5 - FORMAZIONE DELL‟ALBENZA (ALZ) ............................................................... 62 1.6 - CALCARE DI SEDRINA (SED) ............................................................................ 67 2. - I PRISMI CARBONATICI SIN-RIFT ................................................. 71 2.1 - CALCARE DI MOLTRASIO (MOT) ..................................................................... 71 2.2 - CALCARE DI DOMARO (DOM) ......................................................................... 76 2.3 - FORMAZIONE DI SOGNO (SOG) ........................................................................ 81 2.4 - SUCCESSIONE GIURASSICA RIDOTTA E CONDENSATA (SGX) .............................. 84 3. - LA SUCCESSIONE POST-RIFT ........................................................ 85 3.1 - SELCIFERO LOMBARDO (SM) ........................................................................... 85 3.1.1. - Radiolariti del Selcifero Lombardo (RSL) .................................................. 86 3.1.2. - Rosso ad Aptici (RAP) ................................................................................ 88 3.2 - MAIOLICA (MAI) ............................................................................................. 91 4. - LA SUCCESSIONE CLASTICA CRETACICA DEL BACINO LOMBARDO ............................................................................................. 95 4.1 - MARNA DI BRUNTINO (BRU) ........................................................................... 95 4.2 - SASS DE LA LUNA (SDL) .................................................................................. 98 5. - I SISTEMI TORBIDITICI CENOMANIANI .................................... 101 5.1 - FORMAZIONE DI SORISOLE (FSE) ................................................................... 101 4 6. - I SISTEMI TORBIDITICI ED EMIPELAGICI TURONIANI.......... 105 6.1 - FORMAZIONE DI GAVARNO ............................................................................. 106 6.1.1. - Membro delle peliti nere (GVR1) .............................................................. 106 6.1.2. - Membro delle peliti rosse (GVR2) ............................................................ 108 6.2 - FLYSCH DI PONTIDA (PTD) ............................................................................ 111 7. - I SISTEMI TORBIDITICI CONIACIANO-SANTONIANI ............. 114 7.1 - ARENARIA DI SARNICO (SAR) ........................................................................ 114 7.2 - CONGLOMERATO DI SIRONE (CSH) ................................................................ 116 7.2.1. - Membro di Colle Brianza (CSH1) ............................................................. 120 8. - I SISTEMI TORBIDITICI CAMPANIANI ....................................... 121 8.1 - FLYSCH DI BERGAMO (FBG) .......................................................................... 122 8.1.1. - Megastrato di Missaglia (FBGa) ............................................................... 125 8.1.2. - Membro di Rogeno (FBG1) ....................................................................... 126 8.2 - FORMAZIONE DI BRENNO (BNN) .................................................................... 126 9. - I SISTEMI TORBIDITICI PALEOCENICO-EOCENICI ................. 129 9.1 - FORMAZIONE DI TABIAGO (TAB) ................................................................... 129 9.2 - FORMAZIONE DI CIBRONE (IBR) ..................................................................... 133 10. - SUCCESSIONE NEOGENICO-QUATERNARIA ......................... 138 10.1 - UNITÀ DI SOTTOSUOLO ................................................................................. 138 10.1.1. - Supersintema di Vimercate ...................................................................... 138 10.1.2. - Supersintema di Ronco Briantino ............................................................ 138 10.1.3. - Ceppo di Lomagna .................................................................................. 139 10.2 - UNITÀ DI SUPERFICIE .................................................................................... 141 10.2.1. - Unità del Bacino del Serio ...................................................................... 141 10.2.1.1. -Supersintema di Fiorano (FR) ............................................................ 141 10.2.1.2. - Sintema di Torre Boldone (TBO) ...................................................... 142 10.2.1.3. - Supersintema di Grassobbio (BB) ...................................................... 143 10.2.2. - Unità del Bacino della Morla .................................................................. 143 10.2.2.1. - Supersintema della Morla (OR) ......................................................... 144 10.2.3. - Unità del Bacino del Brembo .................................................................. 145 10.2.3.1. - Conglomerato di Cà della Zogna (CZO) ........................................... 145 10.2.3.2. - Formazione di Almenno Basso (AEO) .............................................. 147 10.2.3.3. - Formazione di Cà Marchi (CMH) ..................................................... 150 10.2.3.4. - Formazione di Tornago (TOG).......................................................... 151 10.2.3.5. - Conglomerato
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