Table T2. Defining characteristics for the petrophysical units of Site 1099.

Table T2. Defining characteristics for the petrophysical units of Site 1099.

Petrophysical unit

Depth (mbsf)

Defining characteristics /lithology

Notes

A 1-~9 Defined by petrophysical Group 2 and the smooth character of the physical properties data. The unit is bounded by a decrease in MGS. There are three lithologies contained within this unit: M_D, L_D and T_T.

B 9-~24 Lithologies the same as Unit A, but contains both petrophysical Groups 1 and 3. The unit has lower MGS and GRA density values compared to Unit A. There is a distinct bulge in the MGS and porosity data for this unit.

C 24-32 Characterized by petrophysical Group 2 and the smooth physical properties data, which has a gradual incline—a signature strongly correlated with turbidites elsewhere in the two sites. Visual examination of the core produced an interpretation of mixed lithologies, M_D and T_D,in this unit. The dual lithology interpretation present within this petrophysical unit suggests lithologic uncertainty; from the petrophysical data, it is proposed that the lithology Is more likely to be a turbidite, which could in turn affect the dating of the sequence.

D 32-41 Characterized by the change in character of the data, MGS being the most prominent. The unit consists of petrophysical Groups 2 and 4.

E 41-69 90% lithology M_D with two layers of lithology L_D. The whole unit consists of petrophysical Group 2, reflecting the lithology of well-mixed bioturbated material. The MGS curve is notably smooth. The joining of Holes 1099A and 1099B can be clearly seen in the GRA density and porosity data at 60 mbsf. There is likely to be a 0- to 5-m overlap, though the latter figure is large, considering the close proximity of the holes and the good recovery.

F 69-74 Consists of petrophysical Group 4 and does not correspond to the lithologic log. It shows a steady increase in MGS and GRA density and a large decrease in porosity with depth. The main lithology is M_D, with one 50-cm bed of lithology T_T_.

G 74-82 Defined by the character of the physical properties, which are all constant. The lithology is M_D and the petrophysical group is largely Group 2.

H 82-89 Defined by highly variable physical properties data. Over the 7-m interval there are three lithologies: M_D, L_D, and T_T. It is suggested that the properties scatter is due to the heterogeneity of the unit and the increase in pebbles observed.

I 89-108 Defined by the physical properties data, which is smooth for the MGS and GRA density data but highly scattered for the porosity data. Most of this unit consists of layers of lithology L_D and T_T, with a single 1-m layer of lithology M_D at the top of the unit. The majority of the unit consists of petrophysical Group 2, but there are isolated points of Groups 3 and 4.

Petrophysical unit	Depth (mbsf)	Defining characteristics /lithology	Notes
A	1-~9	Defined by petrophysical Group 2 and the smooth character of the physical properties data. The unit is bounded by a decrease in MGS. There are three lithologies contained within this unit: M_D, L_D and T_T.
B	9-~24	Lithologies the same as Unit A, but contains both petrophysical Groups 1 and 3. The unit has lower MGS and GRA density values compared to Unit A. There is a distinct bulge in the MGS and porosity data for this unit.
C	24-32	Characterized by petrophysical Group 2 and the smooth physical properties data, which has a gradual incline—a signature strongly correlated with turbidites elsewhere in the two sites. Visual examination of the core produced an interpretation of mixed lithologies, M_D and T_D,in this unit.	The dual lithology interpretation present within this petrophysical unit suggests lithologic uncertainty; from the petrophysical data, it is proposed that the lithology Is more likely to be a turbidite, which could in turn affect the dating of the sequence.
D	32-41	Characterized by the change in character of the data, MGS being the most prominent. The unit consists of petrophysical Groups 2 and 4.
E	41-69	90% lithology M_D with two layers of lithology L_D. The whole unit consists of petrophysical Group 2, reflecting the lithology of well-mixed bioturbated material. The MGS curve is notably smooth.	The joining of Holes 1099A and 1099B can be clearly seen in the GRA density and porosity data at 60 mbsf. There is likely to be a 0- to 5-m overlap, though the latter figure is large, considering the close proximity of the holes and the good recovery.
F	69-74	Consists of petrophysical Group 4 and does not correspond to the lithologic log. It shows a steady increase in MGS and GRA density and a large decrease in porosity with depth. The main lithology is M_D, with one 50-cm bed of lithology T_T_.
G	74-82	Defined by the character of the physical properties, which are all constant. The lithology is M_D and the petrophysical group is largely Group 2.
H	82-89	Defined by highly variable physical properties data. Over the 7-m interval there are three lithologies: M_D, L_D, and T_T.	It is suggested that the properties scatter is due to the heterogeneity of the unit and the increase in pebbles observed.
I	89-108	Defined by the physical properties data, which is smooth for the MGS and GRA density data but highly scattered for the porosity data. Most of this unit consists of layers of lithology L_D and T_T, with a single 1-m layer of lithology M_D at the top of the unit. The majority of the unit consists of petrophysical Group 2, but there are isolated points of Groups 3 and 4.

Note: M_D = massive bioturbated beds, L_D = laminated beds, T_D = muddy/clayey diatom ooze turbidite, T_T = terrigenous turbidite.