BH250-247b
Title
BH250-247b
Subject
Pumice
Description
BH250-247a, b, c and d
The lahar field at the given coordinates in Tarlac, Philippines, represents a dynamic volcaniclastic landscape formed in the aftermath of the 1991 eruption of Mount Pinatubo. This site lies approximately 12–15 km downstream from the volcano, within a major lahar transport corridor. Following the eruption, vast amounts of unconsolidated ash, pumice, and lithic debris were deposited on the slopes of Pinatubo and were subsequently remobilized by intense monsoonal rains and typhoons. These processes generated repeated lahars, volcanic mudflows, that traveled through river systems such as the Sacobia–Bamban system and spread across the Tarlac plains. The resulting deposits consist of poorly sorted mixtures of volcanic material, ranging from fine ash to large clasts, often forming thick, layered sequences associated with braided river channels and aggrading floodplains. The landscape remains geomorphically active, with ongoing reworking of sediments during heavy rainfall events. Samples from this site were collected by Jaren Yambing (Class of 2022).
The lahar field at the given coordinates in Tarlac, Philippines, represents a dynamic volcaniclastic landscape formed in the aftermath of the 1991 eruption of Mount Pinatubo. This site lies approximately 12–15 km downstream from the volcano, within a major lahar transport corridor. Following the eruption, vast amounts of unconsolidated ash, pumice, and lithic debris were deposited on the slopes of Pinatubo and were subsequently remobilized by intense monsoonal rains and typhoons. These processes generated repeated lahars, volcanic mudflows, that traveled through river systems such as the Sacobia–Bamban system and spread across the Tarlac plains. The resulting deposits consist of poorly sorted mixtures of volcanic material, ranging from fine ash to large clasts, often forming thick, layered sequences associated with braided river channels and aggrading floodplains. The landscape remains geomorphically active, with ongoing reworking of sediments during heavy rainfall events. Samples from this site were collected by Jaren Yambing (Class of 2022).
Coverage
Location: Lahar Field, Tarlac, Philippines
GPS Coordinates: 15.232778, 120.369722
GPS Coordinates: 15.232778, 120.369722
Creator
Bereket Haileab
Source
From the rock collection of Bereket Haileab. Sample 247b. Housed at Carleton College in Minnesota.
Contributor
Jaren Yambing, '22
Type
Hand sample
Relation
Collection
Citation
Bereket Haileab, “BH250-247b,” BH250 Mineralogy Teaching Collection, accessed April 24, 2026, https://bereket-haileab.geology.sites.carleton.edu/items/show/328.