Gunung Jambu merupakan bukit karbonat yang bersifat soliter berumur Miosen Tengah yang masuk ke dalam Formasi Bojongmanik dengan litologi penyusun berupa batugamping. Gunung Jambu berlokasi di Kecamatan Leuwisadeng, Kabupaten Bogor. Studi diagenesis dilakukan di lokasi ini dengan tujuan untuk mengetahui rezim diagenesis dan proses-proses diagenesis yang terjadi pada batuan beserta korelasinya terhadap porositas batuan. Rangkuman kegiatan yang dilakukan pada penelitian ini adalah pemetaan geologi, pengambilan sampel batugamping, analisis megaskopis batuan, dan analisis petrografi. Pada hasil kegiatan lapangan didapatkan 12 sampel yang dianalisis lebih lanjut menggunakan metode petrografi. Karakteristik proses-proses diagenesis di daerah penelitian yang menambah porositas adalah disolusi, alterasi biogenik, dan kompaksi sedangkan yang mengurangi nilai porositas adalah sementasi, kompaksi, dan neomorfisme. Tipe-tipe porositas yang terbentuk adalah fracture, channel, vuggy, dan moldic. Berdasarkan bukti proses diagenesis yang ditemukan, rezim diagenesis di daerah penelitian adalah rezim laut, rezim bawah permukaan, dan rezim meteorik freatik.

---

Mount Jambu is a solitary carbonate hill of Middle Miocene age that belongs to the Bojongmanik Formation with the constituent lithology of limestone. Mount Jambu is located in Leuwisadeng District, Bogor Regency. Diagenesis studies were carried out at this location with the aim of knowing the diagenesis regime and diagenetic processes that occur in rocks and their correlation with rock porosity. The series of activity consist of geological mapping, limestone sampling, megascopic analysis of rocks, and petrographic analysis. As a result of field activities, 12 samples were obtained which were further analyzed using petrographic methods. Diagenetic processes in the research area that increase porosity are dissolution, biogenic alteration, and compaction, while those that reduce porosity values are cementation, compaction, and neomorphism. The types of porosity formed are fracture, channel, vuggy, and moldic. Based on the evidence of diagenetic processes found, the diagenetic regimes in the study area are marine regime, subsurface regime, and phreatic meteoric regime.